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reopened the cave for study. It was subsequently declared a historic landmark, and tours were set up. Until 2017, the cave was thought to be comparatively small underground structure, at 35 metres long with a depth of 8 metres. However, a second cave was discovered in 2017 which measures 250 metres
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of 1837, it served as an armoury, weapons cache, and hidey-hole for Les
Patriotes. In 1968, the government deemed it a safety risk and closed off the cave. In 1978, the
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long. This dimension may be extended with further exploration.
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Spelunkers discover 15,000-year-old cavern in St-Léonard park
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164:The Secret Montreal Cave You Can Visit And Explore
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