A well-known cave in the area that has been explored and surveyed by the Grupo Espeleológico de Santander del C.A. Tajahierro. Their survey is published in Exploraciones en Solorzano (Santander) in Los Sótanos de la Tierra, No. 5, 1980, Santander (ref. 1980a). The cave has been explored and partially resurveyed (285m, June 2013) as part of a Pete Smith study of the medieval(?) black marks seen through out the cave. (Unfortunately, there is also a lot of modern graffiti).
A walk-in entrance leads to mainly walking passage on one level. Part way along there is an unexplored (?) pitch down on the right and a number of ramps down to a smaller lower level. At the far end of this, a small extension was entered after digging out at Easter 2014. The part of the cave that has not been resurveyed lies down the first ramp and back to the west where there is another entrance (?). There could be about 200m of passage to resurvey here.
Reference: anon., 1980a (survey); anon., 2014b (Easter logbook)
Entrance picture : yes
Underground pictures : yes
Detailed survey : from anon., 1980a
Line Survey :
On area survey :
Survex file : partial (2013)
Passage direction rose diagram: 1/7/2018