He first went caving in Trou du Glaz in 1933, and was immediately captivated by the idea of exploring beyond the cave's known limits. Subsequent explorations there with Pierre Chevalier, Charles Petit-Didier and others culminated in connections to other caves in the massif, forming the Réseau de la Dent de Crolles which, in 1947, became the deepest cave in the world.
He first explored the Trou du Glaz cave in 1933, where he was immediately captivated by the idea of pushing beyond the cave's established limits. Subsequent explorations with Pierre Chevalier, Charles Petit-Didier, and others resulted in connections to other caves in the massif, culminating in the formation of the Réseau de la Dent de Crolles, which became the world's deepest cave in 1947.