Avenc 1 de les Planes del Forn del Vidre

The 0.4x0.7 metre mouth gives way to a conduit of reduced dimensions that, after a step, leads us to a first chamber of 7x7 metres with an irregular ceiling. A crawlway located on the N side of the chamber allows access to the main gallery, about 30 metres long and with a width that oscillates between 6 and 10 metres; the low ceiling in the first third of the gallery gains height after a step, reaching up to 6 metres. The main gallery comes into contact with two orthogonal joints to the W, one at the final end that becomes impassable within a few metres, and the other located halfway along the gallery.

If one accesses through a narrow passage between blocks to the joint located halfway along the gallery, once past this and after overcoming several steps, both descending and ascending, one reaches a vertical narrowness that leads to the point of maximum depth of the cavity.