Naval mine - Knowledge (XXG)

1858: 2756: 1026: 1003:. It was a photo of one of these liners in New York harbour, showing the degaussing coil, which revealed to German Naval Intelligence the fact that the British were using degaussing methods to combat their magnetic mines. This was felt to be impractical for smaller warships and merchant vessels, mainly because the ships lacked the generating capacity to energise such a coil. It was found that "wiping" a current-carrying cable up and down a ship's hull temporarily canceled the ships' magnetic signature sufficiently to nullify the threat. This started in late 1939, and by 1940 merchant vessels and the smaller British warships were largely immune for a few months at a time until they once again built up a field. 847: 1425:

surface before it is launched (3). When the deep line has been unwound to a set length, the anchor is flooded and the mine is released from the anchor (4). The anchor begins to sink and the mooring cable unwinds until the plummet reaches the sea floor (5). Triggered by the decreasing tension on the deep line, the mooring cable is clamped. The anchor continues sinking down to the bottom of the sea, pulling the mine below the water surface to a depth equal to the length of the deep line (6). Thus, even without knowing the exact seafloor depth, an exact depth of the mine below the water surface can be set, limited only by the maximum length of the mooring cable.

377:. The 'torpedo-catamaran' was a coffer-like device balanced on two wooden floats and steered by a man with a paddle. Weighted with lead so as to ride low in the water, the operator was further disguised by wearing dark clothes and a black cap. His task was to approach the French ship, hook the torpedo to the anchor cable and, having activated the device by removing a pin, remove the paddles and escape before the torpedo detonated. Also to be deployed were large numbers of casks filled with gunpowder, ballast and combustible balls. They would float in on the tide and on washing up against an enemy's hull, explode. Also included in the force were several 2037: 1714: 2388: 805:. During a period of five months from June 1918, almost 70,000 mines were laid spanning the North Sea's northern exits. The total number of mines laid in the North Sea, the British East Coast, Straits of Dover, and Heligoland Bight is estimated at 190,000 and the total number during the whole of WWI was 235,000 sea mines. Clearing the barrage after the war took 82 ships and five months, working around the clock. It was also during World War I, that the British 2371:, large coils placed along the ship to counter the ship's magnetic field. Using magnetic probes in strategic parts of the ship, the strength of the current in the coils can be adjusted to minimize the total magnetic field. This is a heavy and clumsy solution, suited only to small-to-medium-sized ships. Boats typically lack the generators and space for the solution, while the amount of power needed to overcome the magnetic field of a large ship is impractical. 99:; or defensively, to create "safe" zones protecting friendly sea lanes, harbours, and naval assets. Mines allow the minelaying force commander to concentrate warships or defensive assets in mine-free areas giving the adversary three choices: undertake a resource-intensive and time-consuming minesweeping effort, accept the casualties of challenging the minefield, or use the unmined waters where the greatest concentration of enemy firepower will be encountered. 2276: 1417: 40: 2512:

after two weeks but have the ship-counter mechanism set to ignore the first two trigger events, and still others in the same minefield (with the magnetic and pressure sensors enabled) may not become armed until three weeks have passed. Groups of mines within this mine-field may have different target signatures which may or may not overlap. The fuzes on influence mines allow many different permutations, which complicates the clearance process.

2658:

destroy the ship itself. These techniques are the only way to sweep pressure mines that is publicly known to be employed. The technique can be simply countered by use of a ship-counter, set to allow a certain number of passes before the mine is actually triggered. Modern doctrine calls for ground mines to be hunted rather than swept. A new system is being introduced for sweeping pressure mines, however counters are going to remain a problem.

2344:) using a special degaussing station that contains many large coils and induces a magnetic field in the hull with alternating current to demagnetize the hull. This is a rather problematic solution, as magnetic compasses need recalibration and all metal objects must be kept in exactly the same place. Ships slowly regain their magnetic field as they travel through the Earth's magnetic field, so the process has to be repeated every six months. 1836: 1265: 2470:, that are streamed from the sweeping vessel thus keeping the sweep at a determined depth and position. Some large warships were routinely equipped with paravane sweeps near the bows in case they inadvertently sailed into minefields—the mine would be deflected towards the paravane by the wire instead of towards the ship by its wake. More recently, heavy-lift helicopters have dragged minesweeping sleds, as in the 1991 Persian Gulf War. 2256:

from their holders, etc. A badly shaken ship usually sinks quickly, with hundreds, or even thousands of small leaks all over the ship and no way to power the pumps. The crew fare no better, as the violent shaking tosses them around. This shaking is powerful enough to cause disabling injury to knees and other joints in the body, particularly if the affected person stands on surfaces connected directly to the hull (such as steel decks).

2917:

countries currently have mining ability. The number of naval mine producing countries has increased by 75% since 1988. It is also noted that these mines are of an increasing sophistication while even the older type mines present a significant problem. It has been noted that mine warfare may become an issue with terrorist organizations. Mining busy shipping straits and mining shipping harbours remain some of the most serious threats.

351: 2525: 163: 1376: 935: 1470:(or command detonation mines) can be in place in peacetime, which is a huge advantage in blocking important shipping routes. The mines can usually be turned into "normal" mines with a switch (which prevents the enemy from simply capturing the controlling station and deactivating the mines), detonated on a signal or be allowed to detonate on their own. The earliest ones were developed around 1812 by 222: 2589:'s Undersea Research Group was once involved in minehunting operations: They removed or detonated a variety of German mines, but one particularly defusion-resistant batch—equipped with acutely sensitive pressure, magnetic, and acoustic sensors and wired together so that one explosion would trigger the rest—was simply left undisturbed for years until corrosion would (hopefully) disable the mines. 895: 1818:

steel cable, the mines on either side are drawn down the side of the ship's hull, exploding on contact. In this manner it is almost impossible for target ships to pass safely between two individually moored mines. Daisy-chained mines are a very simple concept which was used during World War II. The first prototype of the Daisy-chained mine and the first combat use came in Finland, 1939.

2408: 1093: 2598: 801:, mines were used extensively to defend coasts, coastal shipping, ports and naval bases around the globe. The Germans laid mines in shipping lanes to sink merchant and naval vessels serving Britain. The Allies targeted the German U-boats in the Strait of Dover and the Hebrides. In an attempt to seal up the northern exits of the North Sea, the Allies developed the 316: 1502: 2020:. In the next 20 months, mines delivered by aircraft sank or damaged 164 Axis ships with the loss of 94 aircraft. By comparison, direct aerial attacks on Axis shipping had sunk or damaged 105 vessels at a cost of 373 aircraft lost. The advantage of aerial mining became clear, and the UK prepared for it. A total of 48,000 aerial mines were laid by the 2228:

surface. If the bubble reaches the surface as it collapses, it can create a pillar of water that can go over a hundred meters into the air (a "columnar plume"). If conditions are right and the bubble collapses onto the ship's hull, the damage to the ship can be extremely serious; the collapsing bubble forms a high-energy jet similar to a

5892: 5873: 5854: 1345:

seabed. This type of mine had a copper wire attached to a buoy that floated above the explosive charge which was weighted to the seabed with a steel cable. If a submarine's steel hull touched the copper wire, the slight voltage change caused by contact between two dissimilar metals was amplified and detonated the explosives.

1625:) or low-powered sensor detects the possible presence of a vessel, at which point the mine fuze powers up fully and the passive acoustic sensors will begin to operate for some minutes. It is possible to program computerised mines to delay activation for days or weeks after being laid. Similarly, they can be programmed to 185:. Offensive mines are placed in enemy waters, outside harbours, and across important shipping routes to sink both merchant and military vessels. Defensive minefields safeguard key stretches of coast from enemy ships and submarines, forcing them into more easily defended areas, or keeping them away from sensitive ones. 2146:

meticulously charted. In Japan, much of the B-29 mine-laying work had been performed at high altitude, with the drifting on the wind of mines carried by parachute adding a randomizing factor to their placement. Generalized danger areas were identified, with only the quantity of mines given in detail. Mines used in

1556:. Whereas early magnetic mine fuses would respond only to changes in a single component of a target vessel's magnetic field, a total field magnetometer responds to changes in the magnitude of the total background field (thus enabling it to better detect even degaussed ships). Similarly, the original broadband 48: 2137:

zone shipping results, comparing the total economic cost of submarine-delivered mines versus air-dropped mines and found that, though 1 in 12 submarine mines connected with the enemy as opposed to 1 in 21 for aircraft mines, the aerial mining operation was about ten times less expensive per enemy ton sunk.

2497:

the typical pressure displacement of such a vessel. As a result, a mine-sweeper must accurately mimic the required target signature to trigger detonation. The task is complicated by the fact that an influence mine may have one or more of a hundred different potential target signatures programmed into it.

2511:

When influence mines are laid in an ocean minefield, they may have various combinations of fuze settings configured. For example, some mines (with the acoustic sensor enabled) may become active within three hours of being laid, others (with the acoustic and magnetic sensors enabled) may become active

2255:

If the mine detonates at a distance from the ship, the change in water pressure causes the ship to resonate. This is frequently the most deadly type of explosion, if it is strong enough. The whole ship is dangerously shaken and everything on board is tossed around. Engines rip from their beds, cables

2211:

wounds are the most common form of damage. Flooding typically occurs in one or two main watertight compartments, which can sink smaller ships or disable larger ones. Contact mine damage often occurs at or close to the waterline near the bow, but depending on circumstances a ship could be hit anywhere

2136:

with land- and carrier-based air power to strike harder against merchant shipping and begin a more extensive aerial mining campaign earlier in the war. Survey analysts projected that this would have starved Japan, forcing an earlier end to the war. After the war, Dr. Johnson looked at the Japan inner

1826:

Plastic drums filled with sand or concrete are periodically rolled off the side of ships as real mines are laid in large mine-fields. These inexpensive false targets (designed to be of a similar shape and size as genuine mines) are intended to slow down the process of mine clearance: a mine-hunter is

1688:

The anti-sweep mine is a very small mine (40 kg (88 lb) warhead) with as small a floating device as possible. When the wire of a mine sweep hits the anchor wire of the mine, it drags the anchor wire along with it, pulling the mine down into contact with the sweeping wire. That detonates the

1601:

into fuses, or program them to detect a single, highly distinctive target signature. In this way, a mine with a passive acoustic fuze can be programmed to ignore all friendly vessels and small enemy vessels, only detonating when a very large enemy target passes over it. Alternatively, the mine can be

193:

to stop ships from reaching an enemy nation. They are often spread thinly, to create an impression of minefields existing across large areas. A single mine inserted strategically on a shipping route can stop maritime movements for days while the entire area is swept. A mine's capability to sink ships

2550:

can do both tasks. Minehunting pays little attention to the nature of the mine itself. Nor does the method change much. At the current state of the art, minehunting remains the best way to deal with influence mines proving to be both safer and more effective than sweeping. Specialized high-frequency

2496:

Modern influence mines are designed to discriminate against false inputs and are, therefore, much harder to sweep. They often contain inherent anti-sweeping mechanisms. For example, they may be programmed to respond to the unique noise of a particular ship-type, its associated magnetic signature and

2306:

Ships can be designed to be difficult for mines to detect, to avoid detonating them. This is especially true for minesweepers and mine hunters that work in minefields, where a minimal signature outweighs the need for armour and speed. These ships have hulls of glass fibre or wood instead of steel to

2297:

to detect and flag mines. However, they are of questionable effectiveness. Mines in nearshore environments remain a particular challenge. They are small and as technology has developed they can have anechoic coatings, be non-metallic, and oddly shaped to resist detection. Further, oceanic conditions

1918:

is pulled (one end attached to the rail of a ship, aircraft or torpedo tube) which starts an automatic timer countdown before the arming process is complete. Typically, the automatic safety-arming process takes some minutes to complete. This allows the people laying the mines sufficient time to move

1793:), capable of traveling as far as 16 km (10 mi) through or into a channel, harbour, shallow water area, and other zones which would normally be inaccessible to craft laying the device. After reaching the target area they sink to the sea bed and act like conventionally laid influence mines. 1605:

Even as far back as WWII it was possible to incorporate a "ship counter" function in mine fuzes. This might set the mine to ignore the first two ships passing over it (which could be minesweepers deliberately trying to trigger mines) but detonate when the third ship passes overhead, which could be a

882:

Initially, contact mines (requiring a ship to physically strike a mine to detonate it) were employed, usually tethered at the end of a cable just below the surface of the water. Contact mines usually blew a hole in ships' hulls. By the beginning of World War II, most nations had developed mines that

2772:

The Quickstrike is a family of shallow-water aircraft-laid mines used by the United States, primarily against surface craft. The MK65 is a 910 kg (2,000 lb) dedicated, purpose-built mine. However, other Quickstrike versions (MK62, MK63, and MK64) are converted general-purpose bombs. These

2671:

drone) that simulate the acoustic and magnetic signatures of larger ships and are built to survive exploding mines. Repeated sweeps would be required in case one or more of the mines had its "ship counter" facility enabled i.e. were programmed to ignore the first 2, 3, or even 6 target activations.

2098:

harbour in October 1943. One of those mines sank a Japanese freighter. Another B-24 dropped three more mines into the harbour in November, and a second freighter was sunk by a mine. The threat of the remaining mines prevented a convoy of ten ships from entering Haiphong, and six of those ships were

1880:

Laying a minefield is a relatively fast process with specialized ships, which is today the most common method. These minelayers can carry several thousand mines and manoeuvre with high precision. The mines are dropped at predefined intervals into the water behind the ship. Each mine is recorded for

1817:

This comprises two moored, floating contact mines which are tethered together by a length of steel cable or chain. Typically, each mine is situated approximately 18 m (60 ft) away from its neighbor, and each floats a few meters below the surface of the ocean. When the target ship hits the

1433:

Drifting mines were occasionally used during World War I and World War II. However, they were more feared than effective. Sometimes floating mines break from their moorings and become drifting mines; modern mines are designed to deactivate in this event. After several years at sea, the deactivation

1387:

Generally, this type of mine is set to float just below the surface of the water or as deep as five meters. A steel cable connecting the mine to an anchor on the seabed prevents it from drifting away. The explosive and detonating mechanism is contained in a buoyant metal or plastic shell. The depth

102:

Although international law requires signatory nations to declare mined areas, precise locations remain secret, and non-complying parties might not disclose minelaying. While mines threaten only those who choose to traverse waters that may be mined, the possibility of activating a mine is a powerful

2657:

in WWII were sunk during the war. Alternatively, a shallow draught vessel can be steamed through the minefield at high speed to generate a pressure wave sufficient to trigger mines, with the minesweeper moving fast enough to be sufficiently clear of the pressure wave so that triggered mines do not

1659:

Bottom mines (sometimes called ground mines) are used when the water is no more than 60 meters (200 feet) deep or when mining for submarines down to around 200 meters (660 feet). They are much harder to detect and sweep, and can carry a much larger warhead than a moored mine. Bottom mines commonly

1325:

Early mines had mechanical mechanisms to detonate them, but these were superseded in the 1870s by the "Hertz horn" (or "chemical horn"), which was found to work reliably even after the mine had been in the sea for several years. The mine's upper half is studded with hollow lead protuberances, each

1321:

The earliest mines were usually of this type. They are still used today, as they are extremely low cost compared to any other anti-ship weapon and are effective, both as a psychological weapon and as a method to sink enemy ships. Contact mines need to be touched by the target before they detonate,

1080:

When the war ended, more than 25,000 U.S.-laid mines were still in place, and the Navy proved unable to sweep them all, limiting efforts to critical areas. After sweeping for almost a year, in May 1946, the Navy abandoned the effort with 13,000 mines still unswept. Over the next thirty years, more

959:

were used for this). Both of these methods had the disadvantage of "sweeping" only a small strip. A better solution was found in the "Double-L Sweep" using electrical cables dragged behind ships that passed large pulses of current through the seawater. This created a large magnetic field and swept

886:

Later, some ships survived mine blasts, limping into port with buckled plates and broken backs. This appeared to be due to a new type of mine, detecting ships by their proximity to the mine (an influence mine) and detonating at a distance, causing damage with the shock wave of the explosion. Ships

188:

Shipowners are reluctant to send their ships through known minefields. Port authorities may attempt to clear a mined area, but those without effective minesweeping equipment may cease using the area. Transit of a mined area will be attempted only when strategic interests outweigh potential losses.

2789:

air-dropped bombs. Because this latter type of Quickstrike fuze only takes up a small amount of storage space compared to a dedicated sea mine, the air-dropped bomb casings have dual purpose i.e. can be fitted with conventional contact fuzes and dropped on land targets, or have a Quickstrike fuze

2363:

for armor plate. The models were placed within coils which could simulate the Earth's magnetic field at any location. The magnetic signatures were measured with degaussing coils. The objective was to reduce the vertical component of the combination of the Earth's field and the ship's field at the

2358:

Between 1941 and 1943 the US Naval Gun factory (a division of the Naval Ordnance Laboratory) in Washington, D.C., built physical models of all US naval ships. Three kinds of steel were used in shipbuilding: mild steel for bulkheads, a mixture of mild steel and high tensile steel for the hull, and

2227:

The bubble jet effect occurs when a mine or torpedo detonates in the water a short distance away from the targeted ship. The explosion creates a bubble in the water, and due to the difference in pressure, the bubble will collapse from the bottom. The bubble is buoyant, and so it rises towards the

2114:

harbour, and 23 of those immobilized ships were sunk in a subsequent bombing raid. The combined operation sank or damaged 36 ships. Two Avengers were lost, and their crews were recovered. The mines brought port usage to a halt for 20 days. Japanese mine sweeping was unsuccessful; and the Japanese

1424:

A special form of moored contact mines are those equipped with a plummet. When the mine is launched (1), the mine with the anchor floats first and the lead plummet sinks from it (2). In doing so, the plummet unwinds a wire, the deep line, which is used to set the depth of the mine below the water

1061:

The Germans developed a pressure-activated mine and planned to deploy it as well, but they saved it for later use when it became clear the British had defeated the magnetic system. The U.S. also deployed these, adding "counters" which would allow a variable number of ships to pass unharmed before

2087:(RAAF) carrying out 60% of the sorties and the USAAF and US Navy covering 40%. Both British and American mines were used. Japanese merchant shipping suffered tremendous losses, while Japanese mine sweeping forces were spread too thin attending to far-flung ports and extensive coastlines. Admiral 1971:

The USSR was relatively ineffective in its use of naval mines in WWII in comparison with its record in previous wars. Small mines were developed for use in rivers and lakes, and special mines for shallow water. A very large chemical mine was designed to sink through ice with the aid of a melting

1938:

In the 1930s, Germany had experimented with the laying of mines by aircraft. It became a crucial element in their overall mining strategy. Aircraft had the advantage of speed, and they would never get caught in their own minefields. German mines held a large 450 kg (1,000 lb) explosive

2864:...the Royal Navy does not have any mine stocks and has not had since 1992. Notwithstanding this, the United Kingdom retains the capability to lay mines and continues research into mine exploitation. Practice mines, used for exercises, continue to be laid in order to retain the necessary skills. 2454:

If a contact sweep hits a mine, the wire of the sweep rubs against the mooring wire until it is cut. Sometimes "cutters", explosive devices to cut the mine's wire, are used to lessen the strain on the sweeping wire. Mines cut free are recorded and collected for research or shot with a deck gun.

2198:

value", a combination of the initial strength of the explosion and of the distance between the target and the detonation. When taken in reference to ship hull plating, the term "Hull Shock Factor" (HSF) is used, while keel damage is termed "Keel Shock Factor" (KSF). If the explosion is directly

1857: 1781:

The mine is propelled to its intended position by propulsion equipment such as a torpedo. After reaching its destination, it sinks to the seabed and operates like a standard mine. It differs from the homing mine in that its mobile stage is set before it lies in wait, rather than as part of the

1344:

During the initial period of World War I, the Royal Navy used contact mines in the English Channel and later in large areas of the North Sea to hinder patrols by German submarines. Later, the American antenna mine was widely used because submarines could be at any depth from the surface to the

2916:

Mine warfare remains the most cost-effective form of asymmetrical naval warfare. Mines are relatively cheap and being small allows them to be easily deployed. Indeed, with some kinds of mines, trucks and rafts will suffice. At present there are more than 300 different mines available. Some 50

2680:

Another expedient for clearing mines, especially in a hurry, is counter-mining. By this method an explosive is detonated in the area of a known or suspected minefield and the blast either trips off the fuses or the actual explosive contained within the mine or mines. This latter is known as a

1641:

The moored mine is the backbone of modern mine systems. They are deployed where water is too deep for bottom mines. They can use several kinds of instruments to detect an enemy, usually a combination of acoustic, magnetic and pressure sensors, or more sophisticated optical shadows or electro

926:

will concentrate the field through it, due to its magnetic permeability; the mine's detector was designed to trigger as a ship passed over when the Earth's magnetic field was concentrated in the ship and away from the mine. The mine detected this loss of the magnetic field which caused it to

2145:

Between 600,000 and 1,000,000 naval mines of all types were laid in WWII. Advancing military forces worked to clear mines from newly-taken areas, but extensive minefields remained in place after the war. Air-dropped mines had an additional problem for mine sweeping operations: they were not

2122:

began in earnest, using 160 of LeMay's B-29 Superfortress bombers to attack Japan's inner zone. Almost half of the mines were the US-built Mark 25 model, carrying 570 kg (1,250 lb) of explosives and weighing about 900 kg (2,000 lb). Other mines used included the smaller

2689:, Valletta, Malta in WW2 when the British dropped depth charges into the harbour entrance to detonate suspected mines prior to the arrival of an important convoy. It is especially useful against acoustic or pressure mines due to their activation by sound or increases in water pressure. 2755: 1474:. The first remotely controlled mines were moored mines used in the American Civil War, detonated electrically from shore. They were considered superior to contact mines because they did not put friendly shipping at risk. The extensive American fortifications program initiated by the 2488:

bombers Wellington DW.Mk I fitted with degaussing coils to trigger magnetic mines. In a parallel development the Luftwaffe adapted some Junkers 52/3m aircraft to also carry a coil operated by electricity supplied from an onboard generator. The Luftwaffe called this adaption

2545:

As naval mines have become more sophisticated, and able to discriminate between targets, so they have become more difficult to deal with by conventional sweeping. This has given rise to the practice of minehunting. Minehunting is very different from sweeping, although some

2099:

sunk by attacks before they reached a safe harbour. The Japanese closed Haiphong to all steel-hulled ships for the remainder of the war after another small ship was sunk by one of the remaining mines, although they may not have realized no more than three mines remained.

883:

could be dropped from aircraft, some of which floated on the surface, making it possible to lay them in enemy harbours. The use of dredging and nets was effective against this type of mine, but this consumed valuable time and resources and required harbours to be closed.

509:) the Nobel mines proved to be faulty, exploding while being laid, failing to explode or detaching from their wires, and drifting uncontrollably, at least 70 of them were subsequently disarmed by the British. In 1855, 301 more Jacobi mines were laid around Krostadt and 284:

in 1637, describes naval mines with a ripcord pulled by hidden ambushers located on the nearby shore who rotated a steel wheel flint mechanism to produce sparks and ignite the fuse of the naval mine. Although this is the rotating steel wheel's first use in naval mines,

2515:

Mines with ship-counters, arming delays and highly specific target signatures in mine fuzes can falsely convince a belligerent that a particular area is clear of mines or has been swept effectively because a succession of vessels have already passed through safely.

1741:

A Russian invention, the rocket mine is a bottom distance mine that fires a homing high-speed rocket (not torpedo) upwards towards the target. It is intended to allow a bottom mine to attack surface ships as well as submarines from a greater depth. One type is the

2091:, who directed nearly all RAAF mining operations in CBI, heartily endorsed aerial mining, writing in July 1944 that "aerial mining operations were of the order of 100 times as destructive to the enemy as an equal number of bombing missions against land targets." 2292:

and the double-L sweep, were British inventions. When on operational missions, such as the invasion of Iraq, the US still relies on British and Canadian minesweeping services. The US has worked on some innovative mine-hunting countermeasures, such as the use of

2127:

said after the war that the aerial mining by B-29s had been "equally as effective as the B-29 attacks on Japanese industry at the closing stages of the war when all food supplies and critical material were prevented from reaching the Japanese home islands." The

1255:

issued a warning to freight ships in the area, advising them to "maintain lookouts for mines and pay careful attention to local navigation warnings". Ukrainian forces have mined "from the Sea of Azov to the Black Sea which banks the critical city of Odesa."

1251:, Ukraine accused Russia of deliberately employing drifting mines in the Black Sea area. Around the same time, Turkish and Romanian military diving teams were involved in defusing operations, when stray mines were spotted near the coasts of these countries. 605:

carried out a lengthy set of experiments to design and test moored mines that could be exploded on contact or be detonated at will as enemy shipping passed near them. This initial development of mines in the United States took place under the purview of the

1392:

waters it is important to ensure that the mine does not become visible when the sea level falls at low tide, so the cable length is adjusted to take account of tides. During WWII there were mines that could be moored in 300 m (980 ft)-deep water.

2048:

As early as 1942, American mining experts such as Naval Ordnance Laboratory scientist Dr. Ellis A. Johnson, CDR USNR, suggested massive aerial mining operations against Japan's "outer zone" (Korea and northern China) as well as the "inner zone", their

1013:

is just one example of a ship that was struck by a magnetic mine during this time. On 21 November 1939, a mine broke her keel, which damaged her engine and boiler rooms, as well as injuring 46 men, one later died from his injuries. She was towed to

204:, requires nations to declare when they mine an area, to make it easier for civil shipping to avoid the mines. The warnings do not have to be specific; for example, during World War II, Britain declared simply that it had mined the English Channel, 2719:

The SLMM was developed by the United States as a submarine deployed mine for use in areas inaccessible for other mine deployment techniques or for covert mining of hostile environments. The SLMM is a shallow-water mine and is basically a modified

2232:

that can break a metre-wide hole straight through the ship, flooding one or more compartments, and is capable of breaking smaller ships apart. The crew in the areas hit by the pillar are usually killed instantly. Other damage is usually limited.

147:—and even by dropping them into a harbour by hand. They can be inexpensive: some variants can cost as little as US $ 2,000, though more sophisticated mines can cost millions of dollars, be equipped with several kinds of sensors, and deliver a 1881:

later clearing, but it is not unusual for these records to be lost together with the ships. Therefore, many countries demand that all mining operations be planned on land and records kept so that the mines can later be recovered more easily.

1054:) remained vulnerable. Japan developed sonic generators to sweep these; the gear was not ready by war's end. The primary method Japan used was small air-delivered bombs. This was profligate and ineffectual; used against acoustic mines at 1446:

After World War I the drifting contact mine was banned, but was occasionally used during World War II. The drifting mines were much harder to remove than tethered mines after the war, and they caused about the same damage to both sides.

2007:

In September 1939, the UK announced the placement of extensive defensive minefields in waters surrounding the Home Islands. Offensive aerial mining operations began in April 1940 when 38 mines were laid at each of these locations: the

2298:

and the sea bottoms of the area of operations can degrade sweeping and hunting efforts. Mining countermeasures are far more expensive and time-consuming than mining operations, and that gap is only growing with new technologies.

1642:

potential sensors. These cost many times more than contact mines. Moored mines are effective against most kinds of ships. As they are cheaper than other anti-ship weapons they can be deployed in large numbers, making them useful

1560:

of 1940s acoustic mines (which operate on the integrated volume of all frequencies) have been replaced by narrow-band sensors which are much more sensitive and selective. Mines can now be programmed to listen for highly specific

51: 3456:

struck a mine on 20 June, the Royal Navy had had enough, and the next day began carrying out the first minesweeping operation in history, recovering thirty-three 'infernal machines,' the standard British term of the day for sea

2287:

Weapons are frequently a few steps ahead of countermeasures, and mines are no exception. In this field the British, with their large seagoing navy, have had the bulk of world experience, and most anti-mine developments, such as

55: 54: 50: 49: 1618:, it is important to conserve power because they may need to remain active for months or even years. For this reason, most influence mines are designed to remain in a semi-dormant state until an unpowered (e.g. deflection of a 917:

to investigate the mine. The Royal Navy knew that mines could use magnetic sensors, Britain having developed magnetic mines in World War I, so everyone removed all metal, including their buttons, and made tools of non-magnetic

2123:

500 kg (1,000 lb) Mark 26. Fifteen B-29s were lost while 293 Japanese merchant ships were sunk or damaged. Twelve thousand aerial mines were laid, a significant barrier to Japan's access to outside resources. Prince

56: 1442:

because he thought they were leading him into a trap: he believed it possible that the Germans were either leaving floating mines in their wake, or were drawing him towards submarines, although neither of these was the case.

967:

While these methods were useful for clearing mines from local ports, they were of little or no use for enemy-controlled areas. These were typically visited by warships, and the majority of the fleet then underwent a massive

6072: 3747: 1689:

mine and cuts the sweeping wire. They are very cheap and usually used in combination with other mines in a minefield to make sweeping more difficult. One type is the Mark 23 used by the United States during World War II.

1388:

below the surface at which the mine floats can be set so that only deep draft vessels such as aircraft carriers, battleships or large cargo ships are at risk, saving the mine from being used on a less valuable target. In

2443:. Each run covers between one hundred and two hundred metres (330 and 660 ft), and the ships must move slowly in a straight line, making them vulnerable to enemy fire. This was exploited by the Turkish army in the 2434:

A sweep is either a contact sweep, a wire dragged through the water by one or two ships to cut the mooring wire of floating mines, or a distance sweep that mimics a ship to detonate the mines. The sweeps are dragged by

2555:(remote controlled unmanned mini-submarines). It is slow, but also the most reliable way to remove mines. Minehunting started during the Second World War, but it was only after the war that it became truly effective. 1679:

The bouquet mine is a single anchor attached to several floating mines. It is designed so that when one mine is swept or detonated, another takes its place. It is a very sensitive construction and lacks reliability.

103:

disincentive to shipping. In the absence of effective measures to limit each mine's lifespan, the hazard to shipping can remain long after the war in which the mines were laid is over. Unless detonated by a parallel

2891:

displacement target detection sensors. Stonefish can be deployed by fixed-wing aircraft, helicopters, surface vessels and submarines. An optional kit is available to allow Stonefish to be air-dropped, comprising an

1646:

or "channelizing" weapons. Moored mines usually have lifetimes of more than 10 years, and some almost unlimited. These mines usually weigh 200 kg (440 lb), including 80 kg (180 lb) of explosives

3638: 53: 1585:

because several sensors working together (e.g. magnetic, passive acoustic and water pressure) allow it to ignore signals which are not recognised as being the unique signature of an intended target vessel.

130:

using various measures to either capture or detonate the mines, but sometimes also with an aircraft made for that purpose. There are also mines that release a homing torpedo rather than explode themselves.

2319:. They are built with hulls that produce a minimal pressure signature. These measures create other problems. They are expensive, slow, and vulnerable to enemy fire. Many modern ships have a mine-warning 954:

From this data, known methods were used to clear these mines. Early methods included the use of large electromagnets dragged behind ships or below low-flying aircraft (a number of older bombers like the

43:

Polish wz. 08/39 contact mine. The protuberances near the top of the mine, here with their protective covers, are called Hertz horns, and these trigger the mine's detonation when a ship bumps into them.

648:, at a time when the Chilean squadron was blockading the Peruvian ports, formed a brigade of torpedo boats under the command of the frigate captain Leopoldo Sánchez Calderón and the Peruvian engineer 1705:

The ascending mine is a floating distance mine that may cut its mooring or in some other way float higher when it detects a target. It lets a single floating mine cover a much larger depth range.

4349: 4176: 3521:, almost the last to arrive, was struck by an infernal. The following day the boats fished up several of the primitive mines, and both Dundas and Seymour inspected them aboard their flagships. 2876:

influence mine for export to friendly countries such as Australia, which has both war stock and training versions of Stonefish, in addition to stocks of smaller Italian MN103 Manta mines. The

922:. They disarmed the mine and rushed it to the labs at HMS Vernon, where scientists discovered that the mine had a magnetic arming mechanism. A large ferrous object passing through the Earth's 174:. The cost of producing and laying a mine is usually between 0.5% and 10% of the cost of removing it, and it can take up to 200 times as long to clear a minefield as to lay it. Parts of some 4145: 3615: 6174: 3988: 887:

that had successfully run the gantlet of the Atlantic crossing were sometimes destroyed entering freshly cleared British harbours. More shipping was being lost than could be replaced, and

4206: 2364:

usual depth of German mines. From the measurements, coils were placed and coil currents were determined to minimize the chance of detonation for any ship at any heading at any latitude.

1827:

forced to investigate each suspicious sonar contact on the sea bed, whether it is real or not. Often a maker of naval mines will provide both training and dummy versions of their mines.

1651:). In excess of 150 kg (330 lb) of explosives the mine becomes inefficient, as it becomes too large to handle and the extra explosives add little to the mine's effectiveness. 2508:) after a pre-set time. During the pre-set arming delay (which could last days or even weeks) the mine would remain dormant and ignore any target stimulus, whether genuine or false. 557:

after its inventor, caused the word "torpedo" to apply to self-propelled underwater missiles as well as to static devices. These mobile devices were also known as "fish torpedoes".

3755: 2150:

were supposed to be self-sterilizing, but the circuit did not always work. Clearing the mines from Japanese waters took so many years that the task was eventually given to the

5901:, by Stephan L'H. Slocum, Carl Reichmann, Adna Romanza Chaffee, United States. Adjutant-General's Office. Military Information Division, a publication from 1901, now in the 5882:, by United States. Adjutant-General's Office. Military Information Division, Stephen L'H. Slocum, Carl Reichmann, Adna Romanga Chaffee, a publication from 1901, now in the 2710:(short for "encapsulated torpedo"), the MK62 and MK63 Quickstrike and the MK67 SLMM (Submarine Launched Mobile Mine). Today, most U.S. naval mines are delivered by aircraft. 2900:

pack to retard the weapon's descent. The operating depth of Stonefish ranges between 30 and 200 metres. The mine weighs 990 kilograms and contains a 600 kilogram aluminised

6147: 979:

fitted around the perimeter of the hull, energized by the ship's electrical system whenever in suspected magnetic-mined waters. Some of the first to be so fitted were the

6129: 6159: 4621: 1359:

Limpet mines are a special form of contact mine that are manually attached to the target by magnets and remain in place. They are named because of the similarity to the

3295: 652:, who perfected the naval torpedo or mine system to be electrically activated when the cargo weight was lifted. This is how, on 3 July 1880, in front of the port of 2991: 1479: 5685: 2504:

has been triggered a pre-set number of times. To further complicate matters, influence mines may be programmed to arm themselves (or disarm automatically—known as

2379:

Active countermeasures are ways to clear a path through a minefield or remove it completely. This is one of the most important tasks of any mine warfare flotilla.

52: 1663:

These mines usually weigh between 150 and 1,500 kg (330 and 3,310 lb), including between 125 and 1,400 kg (276 and 3,086 lb) of explosives.

1873:

to lay mines around the UK. In WWII, aircraft came into favour for mine laying with one of the largest examples being the mining of the Japanese sea routes in

867:

fleet, which dominated much of the battle of the Atlantic, was small at the beginning of the war and much of the early action by German forces involved mining

5475: 1025: 2493:(lit. mine-search). In both cases pilots were required to fly at low altitude (up to about 200 feet above the sea) and at fairly low speeds to be effective. 2157:

For the purpose of clearing all types of naval mines, the Royal Navy employed German crews and minesweepers from June 1945 to January 1948, organised in the

4850: 2053:. First, aerial mines would have to be developed further and manufactured in large numbers. Second, laying the mines would require a sizable air group. The 1544:

First used during WWI, their use became more general in WWII. The sophistication of influence mine fuses has increased considerably over the years as first

744:

lost two battleships, four cruisers, two destroyers and a torpedo-boat to offensively laid mines during the war. Most famously, on 15 May 1904, the Russian

6224: 3513:

took Penaud and several British captains to examine Cronstadt. While still 2 miles out the two surveying ships were struck by 'infernals'. The fleet left

2110:

on 30 March 1944 in concert with simultaneous conventional bombing and strafing attacks. The dropping of 78 mines deterred 32 Japanese ships from escaping

107:

at the end of their useful life, naval mines need to be found and dismantled after the end of hostilities; an often prolonged, costly, and hazardous task.

2072: 786:

Beginning around the start of the 20th century, submarine mines played a major role in the defense of U.S. harbours against enemy attacks as part of the

253: 5397: 4346: 4084: 408:, scuttled the project as "not fair and honest warfare". In 1854, during the unsuccessful attempt of the Anglo-French (101 warships) fleet to seize the 3261:

National Research Council (U.S.). Ocean Studies Board, National Research Council (U.S.). Commission on Geosciences, Environment, and Resources (2000).

1629:

or render themselves safe after a preset period of time. Generally, the more sophisticated the mine design, the more likely it is to have some form of

3822: 2551:

sonars and high fidelity sidescaning sonar are used for mine location. Mines are hunted using sonar, then inspected and destroyed either by divers or

2076: 4168: 3718: 2280: 2167:

and 300 vessels. Mine clearing was not always successful: a number of ships were damaged or sunk by mines after the war. Two such examples were the

1380: 619: 5651: 4539: 4507: 2612:

A more drastic method is simply to run a ship through the minefield, letting other ships safely follow the same path. An early example of this was

1805:. This weapon was experimental and never went into production. There have been some reports that North Korea may be developing a nuclear mine. The 618:). In 1901 underwater minefields became the responsibility of the US Army's Artillery Corps, and in 1907 this was a founding responsibility of the 6045: 5531: 4475: 4440: 4405: 4141: 3611: 3214: 727: 6168: 6054: 3984: 2057:

had the carrying capacity but considered mining to be the navy's job. The US Navy lacked suitable aircraft. Johnson set about convincing General

5247: 4299: 181:

Mines have been employed as offensive or defensive weapons in rivers, lakes, estuaries, seas, and oceans, but they can also be used as tools of

4198: 4062: 2129: 178:

naval minefields still exist because they are too extensive and expensive to clear. Some 1940s-era mines may remain dangerous for many years.

6007: 5226:

DSTO-GD-0109, September 1996. Ship Structures and Materials Division, Aeronautical and Maritime Research Laboratory. Retrieved 16 March 2009.

4380: 4275: 4011: 3407:

The Crimean War (1854–1856) was the first war to see the successful use of land and sea mines, both of which were the work of Immanuel Nobel.

3361: 3169: 2323:—a simple sonar looking forward and warning the crew if it detects possible mines ahead. It is only effective when the ship is moving slowly. 1697:

The mine is hydrostatically controlled to maintain a pre-set depth below the water's surface independently of the rise and fall of the tide.

607: 598: 587: 474: 2247:

broke in half and sank off the coast South Korea in 2010, was caused by the bubble jet effect, according to an international investigation.

2552: 846: 465:

was designed by German-born, Russian engineer Jacobi, in 1853. The mine was tied to the sea bottom by an anchor. A cable connected it to a

92:, they are deposited and left to wait until, depending on their fusing, they are triggered by the approach of or contact with any vessel. 4651: 2632: 1241: 536:

was a mine attached to a long pole and detonated when the ship carrying it rammed another one and withdrew a safe distance. The submarine

189:

The decision-makers' perception of the minefield is a critical factor. Minefields designed for psychological effect are usually placed on

5554: 2473:

The distance sweep mimics the sound and magnetism of a ship and is pulled behind the sweeper. It has floating coils and large underwater

910:

during low tide. Additionally, the land belonged to the army and a base with men and workshops was at hand. Experts were dispatched from

6244: 2199:

underneath the keel, then HSF is equal to KSF, but explosions that are not directly underneath the ship will have a lower value of KSF.

2158: 1341:

and sugar. When the vial was crushed, the acid ignited the perchlorate-sugar mix, and the resulting flame ignited the gunpowder charge.

5363: 5281: 2083:

in February 1943. Aerial minelaying operations involved a coalition of British, Australian and American aircrews, with the RAF and the

430:

suffered damage due to the underwater explosions of Russian naval mines. Russian naval specialists set more than 1,500 naval mines, or

3648: 3558: 3097: 851: 201: 5954:(Personal account of mine countermeasures operations in Operation Desert Storm during the Gulf War 1991, including the mining of USS 6063: 5973: 5947: 5927: 5827: 5764: 5347: 5113: 5088: 5037: 4980: 4906: 4881: 4796: 4771: 3687: 3595: 3483: 3430: 3385: 3272: 3245: 2151: 478: 5219: 3857: 3892: 3448:

struck first one and then another mine, giving her the dubious distinction of being the first warship damaged by enemy mines. HMS

5419: 4564: 2025: 1435: 1248: 906:

The British experienced a stroke of luck in November 1939, when a German mine was dropped from an aircraft onto the mudflats off

790:. The mines employed were controlled mines, anchored to the bottoms of the harbours, and detonated under control from large mine 6138: 5453: 1396:

Floating mines typically have a mass of around 200 kg (440 lb), including 80 kg (180 lb) of explosives e.g.

6234: 6204: 6199: 6120: 5709: 4702: 2574:

in 2003. The US Navy claims that these dolphins were effective in helping to clear more than 100 antiship mines and underwater

2563: 1786: 1065:

Mining campaigns could have devastating consequences. The U.S. effort against Japan, for instance, closed major ports, such as

783:

or mechanical devices that activated a blast upon tipping. Several mine-laying ships were destroyed when their cargo exploded.

502: 6156: 4613: 2685:. Counter-mining is normally used as a last resort or if other equipment is not available. One example was at the entrance to 6081: 4321: 2966: 2500:

Another anti-sweeping mechanism is a ship-counter in the mine fuze. When enabled, this allows detonation only after the mine

2213: 1940: 1204: 1146: 1097: 1031: 972:

process, where their hulls had a slight "south" bias induced into them which offset the concentration-effect almost to zero.

5625: 5599: 4996: 4232: 3654: 2115:

abandoned Palau as a base when their first ship attempting to traverse the swept channel was damaged by a mine detonation.

1330:. When a ship's hull crushes the metal horn, it cracks the vial inside it, allowing the acid to run down a tube and into a 549:

on 17 February 1864. A Harvey torpedo was a type of floating mine towed alongside a ship and was briefly in service in the

122:

mines requiring physical ignition. Mines may be placed by aircraft, ships, submarines, or individual swimmers and boatmen.

3420: 3135: 3045: 1801:

During the Cold War, a test was conducted with a naval mine fitted with tactical nuclear warheads for the "Baker" shot of

773: 634: 486: 308:

to make weapons, including the failed "floating petard". Weapons of this type were apparently tried by the English at the

6214: 5304: 3308:

Gilbert, Jason A., L/Cdr, USN. "Combined Mine Countermeasures Force", Naval War College paper (Newport, RI, 2001), p. 2.

2623:. However, as mine warfare became more developed this method became uneconomical. This method was revived by the German 2532: 1458:

in France to float down the river, becoming active after a time calculated to be long enough to reach German territory.

331: 3777: 2653:

obviated the need to continuous and painstaking sweeping, but the cost was high. Over half the 100 or so ships used as

1939:

charge. From April to June 1940, the Luftwaffe laid 1,000 mines in British waters. Soviet ports were mined, as was the

1127:, mines laid by North Korean forces caused 70% of the casualties suffered by U.S. naval vessels and caused 4 sinkings. 6239: 6102: 5731:

Hanning, Marcus A.; Smyers, Richard Paul & Thorne, Phil (2010). "Question 11/46: Japanese Use of Mines in WW II".

4949: 2308: 1513:

These mines are triggered by the influence of a ship or submarine, rather than direct contact. Such mines incorporate

764: 758: 748: 712: 672:, on 13 September 1880, which having captured and checked a beautiful boat, it exploded when hoisting it on its side. 5681: 1322:

limiting the damage to the direct effects of the explosion and usually affecting only the vessel that triggers them.

1170:

was probably responsible for the minelaying. In response the U.S., Britain, France, and three other nations launched

772:

Following the end of the Russo-Japanese War, several nations attempted to have mines banned as weapons of war at the

5963: 2706:

MK56 ASW mine (the oldest still in use by the United States) was developed in 1966. More advanced mines include the

6209: 6194: 5863:, by United States. Adjutant-General's Office. Military Information Division, a publication from 1901, now in the 5483: 3068: 2971: 2084: 1806: 1743: 1582: 1199: 4676: 2645:. Typically an old cargo ship, loaded with cargo that made her less vulnerable to sinking (wood for example), the 740:, and most of his crew in the process. The toll inflicted by mines was not confined to the Russians, however. The 6013: 5798: 4842: 3734:

15 June, it was learned that the mouth of the river was protected by electric mines, that the forts at Taku were.

2666: 2662: 2601: 2327: 1578: 821: 611: 396:

used an electric detonator to destroy a moving vessel to demonstrate an underwater mine of his own design to the

305: 5131: 4820: 5752: 4740: 2901: 2877: 2208: 1759: 1594: 537: 489:

from attacking them. It gradually phased out its direct competitor the Nobel mine on the insistence of Admiral

6111: 6093: 5057: 1438:'s British fleet did not pursue and destroy the outnumbered German High Seas Fleet when it turned away at the 5389: 4119: 338:

that was floated toward the enemy, detonated by a sparking mechanism if it struck a ship. It was used on the

4088: 2360: 1602:

programmed specifically to ignore all surface vessels regardless of size and exclusively target submarines.

1475: 787: 3818: 1485:

Modern examples usually weigh 200 kg (440 lb), including 80 kg (180 lb) of explosives (

1334:

which until then contained no acid electrolyte. This energizes the battery, which detonates the explosive.

553:

in the 1870s. Other "torpedoes" were attached to ships or propelled themselves. One such weapon called the

469:

which powered it from the shore, the power of its explosive charge was equal to 14 kg (31 lb) of

6229: 5559: 5237:"Investigation Result on the Sinking of ROKS "Cheonan" by The Joint Civilian-Military Investigation Group" 4582: 3001: 2682: 2459: 2241: 1767: 1451: 802: 741: 733: 297: 1754:

A torpedo mine is a self-propelled variety, able to lie in wait for a target and then pursue it e.g. the

1331: 5659: 5523: 4531: 4499: 4467: 4432: 4397: 3380:. Praeger Security International; War, technology, and history. Greenwood Publishing Group. p. 29. 3206: 2981: 2960: 2649:

was run ahead of the ship to be protected, detonating any mines that might be in their path. The use of

2586: 2392: 2036: 1973: 1615: 1338: 1224: 1178: 716: 626: 543: 182: 6042: 754: 662:

flies when capturing a sloop mined by the Peruvians. A similar fate occurred with the gunboat schooner

126:

is the practice of the removal of explosive naval mines, usually by a specially designed ship called a

3778:"Climate Change & Naval War—A Scientific Assessment 2005—Trafford on demand publishing, Canada/UK" 3677: 1972:

compound. Special aerial mine designs finally arrived in 1943–1944, the AMD-500 and AMD-1000. Various

779:

Many early mines were fragile and dangerous to handle, as they contained glass containers filled with

6219: 5236: 2624: 2616: 2237: 2147: 2119: 2050: 1874: 1802: 1630: 1231: 615: 583: 309: 5564: 5153:

Page: 41, author: Gordon Williamson, John White, publisher: Osprey Publishing, accessed: 9 July 2008

4291: 4058: 3819:"Mark Chirnside's Reception Room: Olympic, Titanic & Britannic: Olympic Interview, January 2005" 960:

the entire area between the two ships. The older methods continued to be used in smaller areas. The

2986: 2481: 2444: 2103: 1722: 997: 473:. In the summer of 1853, the production of the mine was approved by the Committee for Mines of the 296:

The first plan for a sea mine in the West was by Ralph Rabbards, who presented his design to Queen

170:

Their flexibility and cost-effectiveness make mines attractive to the less powerful belligerent in

81: 5795:"WW2 People's War—An archive of World War Two memories—written by the public, gathered by the BBC" 4015: 3722: 2219:

mine attack being a good example of a contact mine detonating amidships and underneath the ship).

2207:

Usually only created by contact mines, direct damage is a hole blown in the ship. Among the crew,

1914:

In some cases, mines are automatically activated upon contact with the water. In others, a safety

1713: 3289: 3033: 2940: 2760: 2703: 2620: 2559: 2485: 2440: 2436: 2352: 2316: 2054: 2041: 1598: 1562: 1552:

have been incorporated into designs. Simple magnetic sensors have been superseded by total-field

1534: 1139: 1120: 1051: 1019: 983: 956: 939: 723: 641: 602: 561: 420: 397: 389: 359: 171: 2799:

Type: aircraft-laid bottom mine (with descent to water slowed by a parachute or other mechanism)

2387: 1577:) and ignore all others. The sophistication of modern electronic mine fuzes incorporating these 1252: 1131: 4643: 1244:

have made frequent use of naval mines, laying over 150 in the Red Sea throughout the conflict.

95:

Naval mines can be used offensively, to hamper enemy shipping movements or lock vessels into a

6003: 5969: 5943: 5923: 5823: 5760: 5740: 5343: 5178: 5163: 5109: 5084: 5033: 4976: 4902: 4877: 4792: 4767: 4376: 4357: 4271: 3683: 3644: 3591: 3479: 3426: 3391: 3381: 3357: 3354:

Power struggles: scientific authority and the creation of practical electricity before Edison.

3268: 3241: 3165: 2466:

instead of a second minesweeper. These are torpedo-shaped towed bodies, similar in shape to a

2463: 2414: 2088: 1439: 1401: 1047: 888: 872: 554: 435: 413: 405: 301: 197: 5273: 5147: 4267: 4260: 3737:(Issue 143 of Document (United States. War Dept.))(Original from the New York Public Library) 3717:. Adjutant-General's Office, Military Information Division, Washington, D.C., United States: 3262: 3159: 2174:

which was scrapped after hitting a mine in a previously cleared area off the Greek island of

5359: 2996: 2873: 2294: 2275: 1671:

Several specialized mines have been developed for other purposes than the common minefield.

1622: 1607: 1590: 1467: 1313:

Naval mines may be classified into three major groups; contact, remote and influence mines.

1069:, for days, and by the end of the Pacific War had cut the amount of freight passing through 1040: 980: 680: 676: 370: 235: 39: 4142:"Houthis increase use of suicide drone boats in recent weeks | FDD's Long War Journal" 3554: 3452:

came to her assistance after the first explosion, only to strike a mine herself. When HMS

3089: 1869:

Historically several methods were used to lay mines. During WWI and WWII, the Germans used

1835: 1337:

Earlier forms of the detonator employed a vial of sulfuric acid surrounded by a mixture of

695:

against the French; they planted nine torpedo mines in the river and blocked the entrance.

6178: 6163: 6151: 6133: 6115: 6097: 6085: 6067: 6049: 5713: 5223: 5135: 4568: 4353: 2721: 2312: 2132:

concluded that it would have been more efficient to combine the United States's effective

2021: 1790: 1730: 1574: 1416: 1397: 1046:

The Allies and Germany deployed acoustic mines in World War II, against which even wooden-

1036: 1015: 704: 684: 591: 443: 350: 31: 6060: 3444:

While nosing about the defences off Kronstadt on 9 June 1855, the British paddle steamer

664: 6181:

updates to above article on naval mines due to Korean War and types and measures against

5658:. Corpus Christi, Texas: Commander Mobile Mine Assembly Group, U.S. Navy. Archived from 3853: 3748:"Naval mine - contained explosive device placed in water to destroy ships or submarines" 3712: 2524: 2106:

torpedo bombers, the US Navy mounted a direct aerial mining attack on enemy shipping in

1264: 1096:

In 1988, an Iranian M-08 mine made a 25-foot (8 m) hole in the hull of the frigate

5213: 4561: 3888: 3469: 2932: 2613: 2467: 2124: 2064: 1960: 1944: 1928: 1770: 1755: 1549: 1190: 990: 923: 810: 737: 579: 529: 494: 439: 385: 339: 327: 319: 272: 162: 111: 5427: 3843:

Campbell, John, "Naval Weapons of World War Two" (London: Conway Maritime Press, 1985)

1809:

prohibits the placement of nuclear weapons on the seabed beyond a 12-mile coast zone.

1197:. A Soviet tanker was among the ships damaged by these mines. In 1986, in the case of 707:, Imperial Chinese forces deployed a command-detonated mine field at the mouth of the 342:

as a drift mine, destroying a small boat near its intended target, a British warship.

256:

tell of naval explosives in the 16th century, used to fight against Japanese pirates (

6188: 5902: 5883: 5864: 5449: 2927: 2686: 2579: 2229: 2183: 1989: 1985: 1956: 1952: 1948: 1895: 1850: 1626: 1597:, with all the programmability this implies, such as the ability to quickly load new 1471: 1327: 1156: 891:

ordered the intact recovery of one of these new mines to be of the highest priority.

876: 806: 780: 688: 649: 645: 521: 506: 466: 374: 355: 281: 5706: 5342:

Oceanography and Mine Warfare. Ocean Studies Board, National Research Council, 2000

5212:

Department of Defence. Defence Science and Technology Organisation. Warren D. Reid,

5054:"United States Strategic Bombing Survey, Summary Report (Pacific War). July 1, 1946" 4710: 934: 5193: 4262:

The Russian Rockefellers: the Saga of the Nobel Family and the Russian Oil Industry

4199:"Here's what makes sea mines Russia's biggest challenge in Ukraine's Mariupol port" 3583: 3007: 2976: 2642: 2637: 2567: 2451:

batteries prevented the British and French from clearing a way through minefields.

2429: 2400: 2195: 2168: 2163: 2080: 2068: 2058: 1862: 1763: 1553: 1153: 1135: 1116: 928: 907: 860: 630: 576: 533: 525: 490: 470: 455: 381:, carrying 40 barrels of gunpowder and rigged to explode by a clockwork mechanism. 239: 175: 123: 89: 73: 6157:"Fighting The Submarine Mine – How Navies Combat A Deadly Sea Weapon" October 1941 6078: 4325: 1482:, which were emplaced or in reserve from the 1890s until the end of World War II. 1081:

than 500 minesweepers (of a variety of types) were damaged or sunk clearing them.

736:, sending the holed vessel to the bottom and killing the fleet commander, Admiral 564:

of 1861–1865 also saw the successful use of mines. The first ship sunk by a mine,

221: 17: 5003: 4236: 3473: 3375: 6026:(Describes American efforts to combat Iranian mine campaign in the Persian Gulf) 5603: 4815:

The Soviet Navy at the Outbreak and During the Great Patriotic War: Introduction

3126:

Greer, William L.; Bartholomew, James (1986). "The Psychology of Mine Warfare".

2950: 2893: 2869: 2707: 2628: 2605: 2539: 2411: 2307:

avoid magnetic signatures. These ships may use special propulsion systems, with

2260: 2133: 1718: 1643: 1566: 1529:. The fuses on such mines may incorporate one or more of the following sensors: 1514: 1375: 1354: 1007: 894: 832: 798: 572: 462: 447: 393: 363: 248: 227: 194:

makes it a credible threat, but minefields work more on the mind than on ships.

190: 127: 2407: 1729:

These are mines containing a moving weapon as a warhead, either a torpedo or a

1092: 1018:

for repairs. Incidents like this resulted in many of the boats that sailed to

4928:

Mines Away!: The Significance of US Army Air Forces Minelaying in World War II

3878:

Piekalkiewicz, Janusz, "Sea War: 1939–1945" (Poole, UK: Blandford Press, 1987)

2575: 2547: 2421: 2336: 2289: 2009: 1996: 1993: 1977: 1840: 1611: 1570: 1557: 1545: 1518: 1124: 969: 961: 911: 550: 409: 401: 270:

made several timed, drifting explosives, to harass Japanese pirate ships. The

267: 85: 5744: 5602:. U.S. Navy Small Business Innovation Research. 21 March 2007. Archived from 5312: 4899:

Spying Without Spies: Origins of America's Secret Nuclear Surveillance System

3395: 2263:-differential over the width of the human body is sufficient to stun or kill 1861:

Camouflaged Iraqi mines hidden inside oil barrels on a shipping barge in the

2955: 2945: 2897: 2597: 2341: 1981: 1522: 1506: 1186: 1066: 745: 708: 565: 498: 482: 477:. In 1854, 60 Jacobi mines were laid in the vicinity of the Forts Pavel and 378: 335: 330:

developed the first American naval mine, for use against the British in the

315: 290: 205: 140: 119: 77: 69: 4941: 3784: 2802:

Detection System: Magnetic/seismic/pressure target detection devices (TDDs)

2736:

Detection System: Magnetic/seismic/pressure target detection devices (TDDs)

2013: 1501: 1162:

In the summer of 1984, magnetic sea mines damaged at least 19 ships in the

1084:

The U.S. began adding delay counters to their magnetic mines in June 1945.

902:, magnetic–minesweeping gear being deployed behind a Royal Navy minesweeper 658: 4997:"The United States Strategic Bombing Surveys (European War) (Pacific War)" 2424:, 7 June 1944. Note her broken back, with white smoke billowing amidships. 2071:

and other bomber aircraft took part in localized mining operations in the

1237:. When the war concluded, eight countries conducted clearance operations. 225:

A 14th-century illustration of a naval mine and page description from the

6036: 5450:"Paravane – Definition and More from the Free Merriam-Webster Dictionary" 4169:"Ukraine says Russia planting mines in Black Sea as shipping perils grow" 2888: 2884: 2571: 2448: 2368: 2095: 1845: 1619: 1538: 1530: 1389: 1216: 1104: 1074: 947: 791: 510: 144: 6103:

Belgian-Netherlands Naval Mine Warfare School, NATO Center of Excellence

5979: 3060: 1509:

bomber during WWII and landed on the ground. Fuse mechanisms are visible

1434:

mechanism might not function as intended and the mines may remain live.

1174:, a minesweeping operation in the Red Sea involving more than 46 ships. 871:

routes and ports around Britain. German submarines also operated in the

597:

After 1865 the United States adopted the mine as its primary weapon for

5106: