1766: CM-6, Sima
Mullir 30T 455182 4795749 (Datum: ETRS89. Accuracy code: G) Altitude 730m
Length 130m Depth 119m
Area position

Updated 18th January 2011

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.

A 9m long rift is a pitch of 17m. A ramp descends to a choke but at the top is the head of a 55m pitch. At the base, 2 small, 1m diameter tubes lead onto the continuation and another pitch of nearly 59m. This appears to add up to 130m and not the indicated 119m.

Reference: SEAD website; file; León García José, 2010 (survey and photos)
Entrance picture: on the SEAD website
Underground picture(s):
Detailed survey:  elevation on the SEAD website : elevation from León García José, 2010. (Cantabria Subterránea. Catálogo Grandes Cavidades.)
Line survey:
On area survey:
Survex file: