Amateur explorers have discovered a network of 15,000-year-old caves underneath a Canadian city, the BBC reports.
The passageway, which is at least 200 metres long, was formed during the last ice age underneath what is now the city of Montreal.
The “once in a lifetime” October find by Luc Le Blanc and Daniel Caron was the result of years of trial and error.
Connected to the Saint-Léonard Cavern, the cave network is six metres deep and parts must be traversed by boat.
PHOTOS: LUC LE BLANC / SOCIÉTÉ QUÉBÉCOISE DE SPÉLÉOLOGIE
