The two entrances of the cave join within a few metres into a low gallery, with the floor occupied by clayey and detrital sediments partly covered by a layer of concretion. This gallery leads into a small chamber with sediments that has a side passage to the left, structured on a parallel joint. The gallery continues with an oval lobulated section, which testifies to several phases of circulation, and leads into a high section, structured on a joint orthogonal to the general system (SW-NE). The gallery continues to be high, with beautiful dissolution formations. There are no clastic and almost no lithogenic processes until reaching a very narrow crawlway that gives way to a final small chamber, through which a perceptible air current emerges. This point is 54 metres of passage from the entrance.

About 8 metres from the end, towards the NW, a narrow gallery opens, at the base of which interesting sediments of rounded pebbles, mainly of slate and cemented sands, can be seen; after 3 metres it forms an elbow and heads to the NE, until at 17 metres it bifurcates into two short passages. The section of this gallery is oval and flattened.

The gallery continues to be high, with beautiful dissolution formations.

It is a fossil resurgence that forms part of the same drainage system as the cova Gran or “A”.

One must denounce the lamentable state in which this cave is found, 134 metres of passage and with quite interesting morphologies; unfortunately it is full of plastic bags, some still full of soil, broken light bulbs, rusty butane gas cartridges, as well as various rubbish, very probably produced by the various archaeological excavations.