A large depression contains two descended holes. This one is on the eastern side of the depression and is a choked shaft of 22m. There are rumours of other shafts in the area, which lies near the upstream end of Cueva-Cubio de la Reñada 2. The other shaft is 634.

References: anon., 1977b (logbook); Corrin J S and Smith P, 1981; Corrin J, 1983c; anon., 1988 (logbook); material in file
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