The small entrance of 0.81x0.44 metres, level with the wall and hidden behind the box trees, gives access to a descending ramp until reaching a narrow passage that opens into a pit of about 4 metres. At its base, on the E side, a narrow ascending gallery ends after a few metres, while in a N direction the gallery descends taking on a steep height; at this point and at ceiling level a conduit can be seen which it has not been possible to access. The gallery continues descending for some metres in a sinuous form until it becomes blocked.