About 100m long, it ends in a chamber sealed off by fallen rocks. On the vaulted walls of this very soft limestone hall, you can see rock art made with a flint point over finger marks that seem to sketch out the art. They date from the end of the Early Magdalenian and the beginning of the Middle Magdalenian (16,000 to 14,000 years ago) and depict horses, aurochs, bison, deer and bears, as well as abstract signs, hands and a phallus.