A secret cavern dating back to the ice age has been discovered in Montreal.
Explorers found the 200-metre long passageway - which includes both a lake and stalactites - below the city. According to a press release, the cavern is over 15,000 years old and is located below Parc Pie-XII in the Saint-Léonard borough.
The discovery comes a few years after an initial network of underground caves hidden beneath Montreal were found. This new cave - discovered by speleologists Daniel Caron and Luc Le Blanc in October - is near the first one and it's far bigger than anyone imagined.
No human has ever seen it until a few weeks ago, and both Caron and Le Blac are still exploring the area. They're not sure how far the tunnel will continue, having so far used inflatable canoes to explore the cavern, which is filled with nearly five-metres of water.
In fact, the discovery is so important that even National Geographic has written about it.
The chambers were formed thousands of years ago during the last ice age when the pressure of massive glaciers split the rock beneath the surface, Caron explained to The Star. Now, to explore it, cavers have to crawl on their hands and knees through muddy tunnels and use rock climbing equipment to get through especially tight areas.
And there's still much, much more to explore.