BA04

From the entrance, we find ourselves at a junction. a slippery climb (wet moss) of 2 metres to the south leads to a strongly inclined slab along a bedding joint that we can follow crawling in the mondmilch for about fifteen metres to an aerated calcified choke. a second slippery climb of 2 metres in height, further east, gives access to another strongly inclined slab along a bedding joint, blowing, which we ascend for 20 metres crawling in the mondmilch. a first tight squeeze must be passed, difficult to negotiate on the way up because of the few holds and the mondmilch, then a second, enlarged with a lump hammer, which gives onto the base of a pit (puits) 7 metres high, 1.5 metres wide and 8 metres long. a climb at the terminus of the joint gives nothing. On the other hand, a climb halfway along the joint, of 5 metres, allows us to find a forced conduit 1 metre in diameter along a bedding joint from which the current of air comes. We follow this forced conduit for 30 metres, the walls are sculpted with fine pluricentimetric gouge marks, and the floor consists of centimetric to pluricentimetric rounded pebbles proving the existence of a flow. This small forced conduit gives onto the base of a forced conduit 3 metres in diameter, ascending along the dip, and strongly incised by a meander. It ends after 10 metres at a wall. It is possible to climb in the blocks on the east wall. Part of the current of air comes from the continuation of the fracture coming from the east, but this fracture is not passable, and we see it for 4 metres requiring an enlargement. At the top of the terminal wall, a blowing inlet in the ceiling has not been forced; a current of air comes from it, but access is difficult and the start consists of a severe vertical tight squeeze.

The base of the pit (puits) consists of a superb active gour.

a non-negligible current of air comes out of the aerated calcified choke, in which no attempt at digging has been undertaken until now. The strongly inclined slab along the bedding joint to the east is blowing. The floor of the forced conduit consists of centimetric to pluricentimetric rounded pebbles proving the existence of a flow. Part of the current of air comes from the continuation of the fracture coming from the east, and a blowing inlet in the ceiling at the top of the terminal wall has not been forced.