Updated 19th February 1999; 23rd February 2001

Shaft lies 20m on 300° from Sima de Levantada (578). First pitch rigged from eye on south of the hole is 33m. The second pitch of 10m is followed immediately by one of 25m. The final pitch is 55m deep ending in a muddy pool.

A window 4m above the entrance pitch floor ends at a 8m pitch to a slippery boulder slope and a flat out bedding plane carrying a strong draught. This was dug through clay to emerge at the bottom of the Sima Levantada (578) shaft. According to León García José, 2010 (Volume 1 and Volume 2), the site is also called M-25.

References: anon., 1986 (logbook); anon., 1989 (logbook); Neill A et al, 1989; anon., 1993b (logbook); Neill Alasdair and Jackson Keith, 1993 (survey); material in file; Corrin J, 1994a; Corrin Juan, 1995b; García José León, 1997 (survey); León García José, 2010 (Volume 1 and Volume 2) (survey)
Entrance picture : yes
Underground picture(s):
Detailed Survey : 1:1000
Line Survey :
On area survey :
Survex file : yes (Amended magnetic declination December 2013 to align with Eur79 grid and coordinates altered to fit ETRS89 datum, April 2014.)