Updated 20th January 2002; 22nd September 2018
Uphill from Sima Cumpleaños. The entrance is hidden in a depression with a limestone face on the downhill side. A 14m pitch to a small hole which could be dug. Stones drop for about 7m, but the hole probably joins with Sima Cumpleaños (459).
There is a probability that sites 999 and 1000 are 460 and 459 respectively. (See 2018 summer logbook).
Reference: anon., 1983b (logbook); anon, 2001d (Christmas
logbook); anon., 2018c (summer logbook)
Entrance picture :
Detailed Survey :
Line Survey :
On area survey :
Survex file :