The upper cave consists of a single gallery 7 metres long in a descending form; its width ranges between 0.5 and 1 metre, while the height does not exceed 2 metres. The cave ends up forming two levels that connect when the upper one ends.

We can access the lower cave by a 1 metre step that leads us to a chamber of 2.5 x 3 metres, where we find a large block of clastic origin that has caused different levels in the chamber; at the E end and below the block, a chimney can be followed that climbs 2 metres between stones and earth. If we go to the deepest end of the cave, which is in a S direction with respect to the entrance, we can also follow below the block and connect with the aforementioned chimney.

We are before a fossil cavity, which in the past had been a spring with two outlets. The erosion forms in both cavities are quite notable.

Both form part of the same group of springs, but at present they cannot be connected by any gallery.

In this part of the cavity some important vaults can be observed, formed by the erosion of water.