0952: Llanas de Porlacebo, Sima de las
San Miguel 30T 458248 4794711 (Datum: ETRS89. Accuracy code: M) Altitude 524m
Length 95m Depth 95m
Area position

Updated 18th January 2004; 31st October 2007

A 95m deep shaft, shown in Actividades Regionales. Exploraciones en Cantabria (anon., 1993a) as site 10. Approximate grid reference taken from the map in the same booklet. Twenty metres of the depth appears to be taken up with the entrance shakehole.

Reference: anon., 1993a (survey); Valero Enrique y Soriano Ángel, 2007
Entrance picture :
Underground picture(s):
Detailed Survey : from anon., 1993a (AEC Lobetum): high res   low res
Line Survey :
On area survey :
Survex file :