Updated 3rd November 2002

This site is described on the web site of the Sociedad Espeleológica Alto Duero who have explored it. It would appear that the entrance has been located with GPS but the altitude (in brackets above) is wrong when plotted on 1:5000 maps. (This site also appears to have the same grid reference as site 1763 - Sima CM-3.)
In the summer 2002, nothing was found at the grid reference. However, 30m SW is a small shaft labelled CM in green paint.

A 4m diameter entrance leads onto a pitch of 33m.

Reference: SEAD website; file; anon., 2002b (summer logbook)
Entrance picture: on the SEAD website
Underground picture(s):
Detailed survey:  elevation on the SEAD website
Line survey:
On area survey:
Survex file: