Avenc de les Pedres

The mouth of the cavity opens in one of the terrain depressions (swallow holes) existing on the same level and which has caused the openings of other nearby pits and which in winter swallow a large quantity of water and snow.

The outer mouth gives access to the first chamber 12 m deep. 4 m are climbed up a steeply inclined ramp and a pit 4 m deep is found, by which one reaches the entrance of the second chamber, at 20 m depth. Along a corridor 16 m long, on a steep slope, with abrupt changes of direction and parallel walls, another very steep slope is found, 70º, giving access to the third chamber, of smaller dimensions than the others. In this one a pit 30 m deep opens, with dimensions 7 x 1 m, in the form of a fissure ending in a point and with the last 4 metres impassable. The descent is totally vertical.

The maximum depth of the cavity is 78 m with a length of 90 m.

Recently (June 2021) it has been possible to confirm that, through a narrow mouth opened in the depression, one enters a pit of about 10 m of drop. At its bottom, an ascending ramp leads to the very narrow mouth of a new pit that does not seem to be very deep, of dark appearance and with some blocks along its course. The walls of the cavity are very unstable and full of mud, which makes it difficult to rig with minimum safety. All this made them give up descending it.

Note: very probably the drop of the cavity is less than that indicated by the first explorers, especially if we take into account that all the topographic revisions of these cavities that have been made later have given a smaller drop.