On reaching the mouth of the cave, it presents itself to us as a vertical accumulation of blocks in a kind of channel. From this lower level a rather narrow gallery with a triangular section is born, which we have called the “galeria dels 6 m” because that is its length.

To access the upper level we must drag ourselves under a block in what we have called the “pas del Cau” and which very probably inspired Casas de Müller when he named the cave. This block remains hanging, like a balcony, some 6 m above the lower level of the cave. Behind it a chamber is formed with a sloping floor, which is not comfortable to be in. In the chamber there are two windows, one opens to the outside through the highest part of the cave (in fact, it would be the upper mouth) and the other gives access to a descending ramp with a steep gradient, on the order of 45 degrees. The gallery of the ramp is 13 m long with sections open to the outside.

The floor is very unstable and as we advance we send stones rolling down, which is why the use of ropes is more than a recommendation. In its lower part, the gallery opens to the outside, where it forms a small scree of the stones that have fallen there.