Forat del Graller

The access through the upper mouth is formed by two passable conduits and a third impassable one through which the water flows. The large mouth gives access to a gallery on a steep slope, this becoming more pronounced between -29 and -39 metres, where it is cut at the midpoint of another almost parallel gallery but of a very different appearance, which can be ascended for about 30 metres of route and 15 of drop until we are right below the blocks of the entrance gallery, a few metres from the mouth. The upper zone of that gallery, in times of abundant water, is traversed by part of the water flow that ends up being lost in a narrow passage.

Once back at -39 metres, there is the possibility of continuing along the South gallery or else along that of the diaclases, which would be the continuation of the entrance one. After 25 metres it places us at the head of a series of steps until reaching -79 metres of depth, a junction point in a chamber with the lower part of the parallel gallery, which we had left at -39 metres.

From this chamber, by means of a single conduit of modest sections, 2 metres high by 1 metre wide, this is traversed by the water in a tumultuous way. The cavity develops in some calco-schistose strata.

The upper zone of the gallery, in times of abundant water, is traversed by part of the water flow that ends up being lost in a narrow passage. Once at -59 metres, the place where the water current re-emerges, one must follow it through various steps, the longest of -9 metres, until reaching the junction chamber, already described, located at -79 metres. After about 80 metres of route and passing some short “rapids” one reaches the Font del Graller, where the water emerges and one returns to the outside.

Once at this previous point one descends on a steep slope to -59 metres, the place where the water current re-emerges; one must follow it through various steps, the longest of -9 metres, until reaching the junction chamber, already described, located at -79 metres. From this chamber and by means of a single conduit of modest sections, 2 metres high by 1 metre wide, this is traversed by the water in a tumultuous way. After about 80 metres of route and passing some short “rapids” one reaches the Font del Graller, where the water emerges and one returns to the outside.

As the cavity is located within the limits of the Parc Nacional d'Aigües Tortes i Llac de Sant Maurici, access is very probably restricted, since the area of the Bony del Graller is a protected space; therefore, it is advisable to find out at the Park offices before carrying out the exploration.