Cavity formed along a fissure running NE-SW, parallel to and 19 metres away from the one that forms the avenc de la Serra del Masiet.

The cavity has a total length of 267 metres.

At the mouth a tree serves us to re-rig the first 8.65 metre pit; at the base, if we continue in a NE direction we find a steep descending ramp that soon eases off until reaching a 7.4 metre pit; at the base we find a narrow pit that ends 5 metres further down.

Back at the base of the first pit, continuing in a SW direction we find a pit of less than 4 metres, followed by a steep ramp that places us at the head of a narrower pit 10 metres deep. At the base of the pit and in a SW direction a fairly narrow passage gives access to a short 10 metre gallery with a small pit among blocks. Back at the base of the 10 metre pit and in a NE direction, a steep ramp leads us to the head of a 9 metre pit; at its base and in a NE direction we must pass through a very narrow crawl that places us above a pit 7 metres deep and 0.5 metres wide; once at the base we reach a wide descending gallery until arriving at an area of large blocks down which we can descend a drop of about 9 metres. At this point we are at the -63.5 metre level; from here, among fairly unstable blocks, there is a pit one metre wide that for prudence has not been descended but which, measured with a distance meter, gives a drop of 15.6 metres, which would give the cavity a total drop of -79 metres.

If from the mouth of the pit we head outside in the direction of the barranc dels Esclots following the line of the fissure, once we have begun to descend the slope we find a double mouth; at floor level we enter a gallery while at the same point at our feet a pit opens up. Following the gallery we soon find a collapse that connects with a lower gallery; continuing on we pass under a large slab and reach the pit that comes from the upper mouth.

Back at the double mouth, we enter a pit that at -5 metres places us in a gallery that connects with the collapsed point of the upper gallery.

Continuing down the pit, after -8 metres we reach the lower gallery; this can be followed in both directions, towards the SW one reaches the -26.6 metre level while in a NE direction one reaches the -23 metre level.