Gouffre Mirolda
Gouffre Mirolda is a karstic cave located in the Haut-Giffre mountain range, in the commune of Samoëns, Haute-Savoie, France. It is connected to the Lucien Bouclier cave system, and has a depth of −1,661 m (−5, 449 ft). It is the sixth deepest cave in the world.
Cave data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).