This site is described in León García José, 2010 (Volume 1 and Volume 2). (Cantabria Subterránea. Catálogo Grandes Cavidades.) The shaft was explored in 1984 by the GESCAT team. A 110m pitch descends to a number of much smaller drops.
Reference: León García José, 2010 (Volume 1 and Volume 2) (survey)
Entrance picture:
Underground picture(s):
Detailed survey: elevation from León García José, 2010 (Volume 1 and Volume 2). (Cantabria Subterránea. Catálogo Grandes Cavidades.)
Line survey:
On area survey:
Survex file: