Like Les Trois-Frères, Tuc d'Audoubert is a sanctuary cave, mainly used for spiritual activities. It is the only one to spread over three levels:
- The lowest, the Réseau Inférieur, contains the Volp underground stream and its re-emergence which enables access to the cave;
- The Réseau Médian, only present downstream 3 m above the stream. It has evidence of Magdalenian frequentation, with habitation zones and parietal engravings;
- The Réseau Supérieur is accessed through a narrow vertical shaft 14 m high, extends over 450 m; its passage is sometimes difficult as a crawling passage divides it into two. Apart from the famous parietal engravings with unreal or fantastic animals, traces of Magdalenian passage have remained visible on the clay floors: foot and finger prints, bear skulls cracked to extract the teeth, broken concretions etc. The clay bison are to be found in the cave’s final gallery.