A collapse entrance located at the bottom of a sinkhole about 5 x 3 metres which, after a narrow passage, leads to chamber I (28 x 12 metres maximum dimensions), with a sloping floor occupied by a cone of exterior debris. Below this first chamber there is a small room of small dimensions.

At the bottom of chamber I there are two openings, one main and the other of very reduced dimensions, which give access to chamber II (17 x 12 metres) with a ceiling formed by a bedding plane. At its N end, a portico leads out into the middle of a gallery 22 metres long which, at its NE end, leads out into chamber III'. This, about 15 x 10 metres, is occupied by large blocks of graviclastic origin and communicates with chamber II through a crawlway and a passage between the blocks, and with chamber I through an upper gallery 6 metres long. A step formed by fairly concretioned blocks delimits this chamber from chamber III, which occupies a lower position.

This chamber III, 39 metres long and 6 to 11 metres wide (considering it together with the Galeria dels Gours), has a slight slope towards its midpoint.

At the crossing between chambers III, III' and the CD gallery, an accumulation of blocks cemented by concretion laterally limits the entrance to the Galeria del pou, 36 metres long and 2 to 7 metres wide.

The walls are covered by a considerable lithogenic process and some large stalagmites, especially one located towards the back of the hall (known of old as la Campana).

Chamber III has a slight slope towards its midpoint, where a small depression collects water during the rainy period, which comes from the S end and from the N, through a series of fossilised gours.

At 3 metres from the central absorption point, a small erosion pothole of 2 metres leads to a short lower gallery of 6 metres.

At 13 metres from the start of the Galeria del pou, a highly concretioned pothole of 5 metres cuts it and it continues afterwards until ending in a laminador. The bottom of the aforementioned pothole is the point of maximum drop in the cavity.