This site 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 site has been located but not recently explored by the Matienzo Caves expeditions.
The current entrance to the cave (GPS'd above) is not the same as the original one. However, the current entrance is blocked with a pile of dead animals. Site 4019 is nearby.
At Easter 2007, Pete Smith was shown the current cave entrance and he "got in from the opposite side of the stream passage", shown on the modified survey.
Reference: anon., 1980a; anon., 2007b; anon., 2014b (Easter logbook)
Entrance picture :
Underground pictures :
Detailed survey : from 1980a : modified (2007) from 1980a
Line Survey :
On area survey :
Survex file :