A pit 4.5 metres deep, with some ledges, leads to a gallery 6.5 metres long, with a low roof at first and somewhat higher towards the end, where it turns sharply to the left at an angle of almost 90º and leads to a small chamber 6 x 3 metres with a maximum height of 5 metres. From this same chamber we will descend a vertical drop of 4.5 metres that gives onto a very narrow passage where there is another drop. Then we will follow a very narrow gallery in the opposite direction from where we came. On reaching another small chamber, behind a block there is a gallery with a floor covered in cobbles. Once the sump has been passed we will reach a gallery and, at the end of it — which forms a small chamber —, at an almost right angle, a gallery 43 metres long opens to the right, very narrow and of variable height between 1.5 and 3.5 metres. At the end of the gallery two very small passages make progression impossible. The other known survey, that of the GEB, gives a slightly shorter length: 105 metres and a depth of 19 metres.

At this point there is a small sump which very often can be found flooded. This last gallery is the main water supply conduit of the cavity.

A pit 4.5 metres deep, with some ledges, leads to a gallery 6.5 metres long. From this same chamber we will descend a vertical drop of 4.5 metres that gives onto a very narrow passage where there is another drop. Then we will follow a very narrow gallery in the opposite direction from where we came. Once the sump has been passed we will reach a gallery. At the end of the gallery two very small passages make progression impossible.