B28

From the surface, one must squeeze between blocks to reach a crossing. On one side, following a bedding joint, one arrives at the top of a meander 60 cm wide; after 5 to 6 m, the meander widens. One then reaches the top of a pit, which must measure 5 to 6 m. On the other side, it is possible to travel for about ten meters along another, larger meander, carved in the black Urgonian, veined with white.

At the top of the pit, two possibilities present themselves: a slight climb gives access to a gallery that rock bridges quickly make impassable; below the climb is a descending meander, also quickly impassable. However, on the small ledge of the first step of the meander, an opening barely as big as a fist gives access to what seems to be a void (falling stones). In the other meander, a 2 to 3 m step is descended by climbing, but the bottom is choked by a collapse. Slightly higher up, a window allows access to a meander, also choked by collapse, which lets a blowing draught filter through.