Gresse-en-Vercors, FR
Grotta: profondità 50m, nel massiccio Vercors (massif du) / Hauts plateaux et contreforts du Vercors oriental.
Listen to the audio guide for N°3 (Gouffre) [Gouffre Numéro 3] Free on WIP — starts by itself when you arrive, even with the screen off