Comblain Discoveries: Abîme Cave Come and admire its splendid chambers and its impressive 22 metre deep abyss. Thanks to its preserved ecosystem the cave has been listed as an "underground cavity of scientific interest" A large number of bats also profit from the calm location for hibernation. Throughout the year come and see this natural jewel, embellished by original amusements mixing together fantasy, humour and scientific information. We can also offer nature walks for groups, on reservation, throughout the year, plus thematic walks.