Updated 3rd May 2007; 3rd May 2009; 4th October; 13th December 2010; 26th September 2012; 28th February 2013; 7th September 2017; 21st September 2018
A 22.5m drop off the western side of the pot lands on boulders. A short crawl on the right hand side leads to a large (25 x 35m) chamber with a well decorated, low passage leading off for approximately 70m and choked at the end. A junction half way along this passage leads to a well decorated chamber with empty gour pools and stal ending at a flowstone wall. A slot in the floor chokes after 4m.
To the left of the pitch chamber, a route leads down a loose boulder slope
to a 25 x 25m chamber. A calcited skeleton of a possible bear with 4cm long
incisors and a 35 x 15cm skull lies in the centre of this chamber. A number
of other bones and antler remain litter the floors. At Easter 2009, photographers removed boots and walked around in wetsuit socks to conserve formations and deposits.
Photos were taken in August 2017 but not shared. Photos from 2018 are shown below.
References: Kendal Caving Club and Manchester University
Speleological Society, 1975; Corrin J S and Smith P, 1981; anon., 1994b
(logbook); material in file; Corrin J, 1994b; anon., 2007b (Easter logbook);
Corrin Juan, 2007a; anon., 2009a (Easter logbook); anon., 2017c (summer logbook); anon., 2018b (Easter logbook); anon., 2018c (summer logbook)
Entrance pictures : 2009 & 2018
photos from summer 2018
complete panorama tour of Los Hoyos (Paul Fretwell, Sept 2012)
interactive panorama photos of the chamber: 1 2
photos from summer 2010
photos from Easter 2009
bones, skeletons and formations (Easter 2007)
3D photos and printing
Detailed Survey : 1:500 pdf
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.)