The Grotte Annette is an astonishing discovery outing. It takes you through a series of very old, comfortable and sometimes richly concretioned galleries, all without the need for ropes. Some passages will require skill and flexibility, but the arrival at the bottom of the Puits de la Gnôle will reward visitors for all their efforts. This incursion into the heart of the Dent de Crolles will delight all those who want to discover the underground world, including children aged 10 and over, for whom this day’s adventure will undoubtedly be unforgettable.