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Prehistoric Caves Found Under Montréal

Pie-XII Park lies in the heart of Montréal, surrounded by busy city streets. But it's what lies beneath those streets that has cave experts and city residents buzzing. A new network of caves, dating back to the Earth's last Ice Age, and extending nearly 700 feet, were discovered in October by Daniel Caron and Luc Le Blanc, two speleologists (cave experts). The find was only recently announced after the site was secured. On October 12, Caron and Le Blanc were exploring the already well-known St. Léonard cave that lies just underneath Pie-XII Park. The original portion of the cave had been discovered in 1812, but cave experts have long speculated that more was hidden beneath. For most of Montréal, however, the large network lurking below the city was unknown. "They’ve dug sewers and made basements, but no one had ever seen them," La Blanc said of the cave network. Caron and Le Blanc decided to explore their hunch in 2014, when they began spelunking through the St. Léonard caverns searching for new passages. Le Blanc, armed with a new radiolocation kit, and Caron, using a divining rod, were hunting for voids or signs of water lying on the other side of the cave's walls. By 2015 they had found a small, narrow opening in the back of one cave. Using a small camera, fellow speleologist François Gelinas was able to peak through the opening, where they saw a large room just behind the wall. Though eager to bust through the wall, they weren't able to move past it until nearly two years later. The cave walls in St. Léonard are made of solid limestone, and opening a passage required industrial-strength drills. Once they were through, they entered a large room, climbed down a big drop, and entered a tall, narrow hall. "The walls are perfectly smooth and the ceiling is perfectly horizontal," said Le Blanc. They estimate the ceiling to be roughly 20 feet high. In addition to the smooth limestone walls lining the cave, stalagmites and stalactites are found throughout the passage. According to the Quebec Speleological Society, to which both men belong, a centimeter of stalagmite takes about a thousand years to grow.

Read More: National Geographic

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