Updated 20th January 2002; 22nd September 2018; 30th October 2020

   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). This was proved in October 2020 so sites 999 and 1000 had been removed for re-assignment.

Reference: anon., 1983b (logbook); anon, 2001d (Christmas logbook); anon., 2018c (summer logbook); anon., 2020d (autumn logbook)
Entrance picture :
Underground picture(s):
Detailed Survey :
Line Survey :
On area survey :
Survex file :