The cavity is structured on a system of fissures, which at their intersections acquire a little width. It communicates with the exterior through an elongated opening that gives way to a first vertical drop of -3 metres where a floor forms on a choke of blocks; at one end there is a second step, which allows descending to the lower level, oriented N-S and very narrow, ending on the S side in a small semicircular shaft about 3 metres wide by 2 deep.