Updated July 27th 2000; 17th October 2003; 9th November 2003; 1st February 2006; 6th May 2007; 4th May 2009; 30th June 2018

Entrance is small and easily missed. A 25m shaft drops to a parallel shaft, 3m offset, and another shaft of 25m. An excavated crawl at the base enters a major level with numerous bouldery shafts. Three of these are undescended. The main tunnel is at the same altitude as that in Torca del Coterón (264).
The site was partially re-explored in 2003 and bolts for re-belays are now on the entrance pitch. During the 2003 trip, a p10 on the left of the western passage was free-climbed; the draught seemed to be coming out of the eastern passage; there were passages explored at the base of the entrance pitch that are not shown on the survey - across the top of a choked pit a rift passage can be entered which gets too tight. It could be chiselled out to enter the larger continuation beyond.
Over Easter 2007, a team surveyed 42m at the base of the entrance pitch: a passage needs enlarging and a rope is required for a 10m pitch. A sketch of extension can be found here. The survey can be redrawn when the passage 'goes'. At Easter 2009, an extension of 11m was made to this. (See batch 0413-09-01)

References: anon., 1982 (logbook); Corrin J, 1983c (survey); anon., 1983a (Easter logbook); material in file; anon., 1993b (logbook); anon., 2000c (Summer logbook); anon., 2003c (summer logbook); Corrin Juan, 2005; anon., 2007b (Easter logbook); Corrin Juan, 2007a; anon., 2009a (Easter logbook); anon., 2009a (Easter logbook)
Entrance picture : yes
Underground picture(s):
Detailed Survey : from 1982: low res  high res (note that the compass arrow is out by 180 degrees on these surveys) sketch of 2007 Easter extensions
Line Survey :
On area survey :
Survex file : yes (Easter 2009) (Amended magnetic declination December 2013 to align with Eur79 grid and coordinates altered to fit ETRS89 datum, April 2014.)   
download South Vega System (Amended magnetic declination December 2013 to align with Eur79 grid and coordinates altered to fit ETRS89 datum, April 2014.)
Passage direction rose diagram: 30/6/2018