6Jean Bernard: Samoens, France
Located in the French Alps, Jean Bernard was considered the deepest known cave in the world for more than twenty years. The entrance to Jean Bernard was discovered in 1959; there are currently eight entrances, the highest being 2260 m above sea level. The search for the world’s deepest
cave has always been something of an international competition, and by the 1980s deeper caves than Jean Bernard had been discovered. Today, it ranks as the 5th deepest cave in the world.