567 Torca del Hoyón
Alisas VN47569331 Alt. 571m  Length 1885m Depth 228m

Updated 19th February 1999

Explored by the Tarragona cavers. Their survey gives a depth of 313m; the length is supposed to be 2km. What follows is Simon's description: needs amending, throwing out etc:

Entrance series of 5 pitches (more easily rigged for ladders) of 20m, 8m, 10m, 18m and 34m drops into the start of the 'meanders' which is 300m of traversing in the roof of a trench with a little water in the bottom. A drop down to floor level is followed by 100m of crawling which involves 3 wet-ear ducks and a stal grill all of which are liable to sump.

A large passage is met at the top of a large, muddy, bouldery pitch with another inlet on the left. The way on is a traverse over a rock bridge to the left with a climb down of 10m and an anticlockwise traverse through 270 degrees to a large, loose rock bridge which is the belay for the next 31m pitch. This area is very muddy and unstable with boulders falling spontaneously. At the base of the pitch 700m of large stream passage leads to a blockage at stream level. This can be bypassed by a nasty climb up, about 100m back from the blockage, into roof passages which drop into the stream where a stomp meets a large and clear sump. The draught apparently comes out of a choked bedding which is being dug. Side passages total about 1km in length; one of them heads towards Cueva del Molino (sites 791 and 727) near Bustablado which is at 200m altitude. The stream heads towards Matienzo and a positive dye test has been carried out to Cueva del Comellantes (040).

References: anon., 1985a (Easter logbook); anon., 1985b (logbook); Corrin J, 1986 (survey); Corrin J, 1987; pers comm.; material in file; anon., 1987 (logbook); Corrin J and Knights S, 1988; Corrin J, 1992b (survey); García José León, 1997 (survey); Corrin Juan, 1997c
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