The entrance forms a pit 3 by 6 metres and 4 deep, open at the NW end of the main gallery. This gallery, 45 metres long, is completely rectilinear towards the SE, of very high section and progressively narrowing. The floor is flat until at the final part, once the gallery is narrow, it descends considerably to the point where exploration through the middle part of the fissure is necessary, at a height that oscillates between 5 and 10 metres from the base, due to its narrowness. The gallery receives some branches developed along a network of fissures that take the single direction E15S – W15N. This is the direction the cavity now takes, to then after 14 metres reach the junction of five galleries, the longest of them continuing 12 metres in the original direction towards the SE. This crossing, having a little more width than the rest of the gallery, allows one to descend to its bottom where a new lower gallery is found.

Back at the entrance mouth, on the NE side there is a descent that, in the form of a stepped pit, reaches some superimposed lower levels, since gallery arms come out on either side, in the general direction E15S – W15N, which at the western end connect with two branches coming from cave no. 3, although the passage is impenetrable due to its narrowness.