Avenc de Sant Marçal

The small entrance mouth gives access to a first 8-metre pit, which widens as it descends. At one end of the base, a tortuous gallery begins that by short ramps and a small step places us in an 11-metre pit that ends in a cul-de-sac. Halfway down this pit we must access a window that places us in a short ramp gallery and a small final pit of a little more than 5 metres.

A new vertical of 14 metres allows us to access a room of certain dimensions at the level -45.7 m. If we do not stop in the room, the pit continues another 54 metres, where the maximum depth of this route is reached. About 17 metres before reaching the bottom, on the SE wall of the pit, through a small window one can access a small lateral pit of 9 metres of drop.

Once again in the room at -45.7 m, beside the NW wall and between blocks we find two openings that give way to a single pit, this one of 56.7 m. A few metres into the descent, a window communicates with the pit of the other route and a little further down one can access a small lateral conduit that again communicates with this pit. Before reaching the bottom, one must move towards the N wall, which has been gaining width, in order to access a small ledge located between the main pit and a new one of 15 metres; this pit communicates by means of a strong ramp with the last pit of 8 metres of depth, where -121 metres is reached.