Tresviso Caves Project

Tresviso Caves Project Gazetter

T153: Sima del Grajal


Area:Mazarrasa Mines
East, North:360517, 4785247 (nearby)
Coordinate Quality:GPS
Long, Lat:-4.7170338838648, 43.207095116934 (map)
Elevation (m):1843
Length (m):130
Depth (m):-148
Active Lead:
Survey Available:


25m above and south of T151


A large natural snow-plugged, crescent shaped shaft Entrance


A large natural snow-plugged, crescent shaped shaft. At the eastern end a climb down behind the snow leads to a large chamber. A lot of mine debris was held up by rotting beams and the dangerous descending passage down to a natural meander is reached, narrow in places and blocked(?) in others.

At the bottom there was two leads
a windy meander that needs explosives (the meander appears to open after 1-2m)
An ascending tube with no draft, very tight as well.


L.U.S.S. (1979) (Explored by Kingswood)
A.D.KAMI. (2012) Memorias Beges 2012
A.D.KAMI. (2013) Memorias Beges 2013
T.C.P. (2016, 2021)


Entrance Entrance