Updated 13th May 2007; 10th, 27th October 2007; 6th January 2011; 19th February, 20th October 2016; 1st July 2018; 20th June 2021; 21st May 2025

   A strongly draughting entrance excavated in 2006 when the explorations in Cueva del Torno (site 2366) were occurring. The entrance could not be located in dense undergrowth in August 2016.
   A low slope leads to the top of a 5.5m pitch and the landing is on a debris cone bridged over a further 10m drop. (At Easter 2007, pits around the entrance pitch were investigated and found to choke). To each side of the cone is open passage - to the northwest is a 6m wide route that requires digging to where it disappears out of sight; in the opposite direction a strong draught through a tight, excavated section leads to a further dig which was opened up. There are several unexplored passages on the left in this mainly hands-and-knees crawling section (Whippet's Way) and a passage sets off on the right after some 50m - Glory Grabber's Gallery. A squeeze past a decorated section enters a slightly larger section with choked inlets. About 80m after the stal squeeze the route become a walking size (dry) streamway - Wild Cat Alley. Pumpkin Chamber is reached on the right (3 x 5 x 4m high). This has various digs including the continuation of the way in - a very low, draughting bedding plane over mud and calcite, apparently pushed for 20m.
   In Cascade Chamber, a low dig on the right was excavated at Easter 2007 to a 4m drop that requires tackle. Further excavation was required in April 2025 when the tight pitch was found to be more spacious at the bottom, but choked with sticky mud.

   Continuing to the southeast in Whippet's Way, the passage (again with unexplored side passages) lowers to a flatout crawl with a very strong draught and slopes down to meet a 12m pitch. To the northwest Pleb's Passage continues for over 100m to a pool and then another 33m to a low draughting duck. This 33m was surveyed at Easter 2025 and pushed beyond the low, draughting duck.
Logbook extract by James Carlisle: "It wasn't possible to see through to the other side of it to check how long it was. The best method was to slide in feet first and use my wellies to get a feel for the ceiling profile. Approximately a body length and a half in, my toes identified some more usable airspace, so I decided to go for it. Moving slowly and cautiously, trying not to make waves, I eventually popped out into a hands-and-knees canal, which soon became standing height. The passage then went around several corners in a series of cross-rifts, before a second duck was met. The airspace in this one was similar to the first, but the same feet-first manoeuvre now met with less success: after reaching my body length and a half limit, there was no sign of any improvement. With no one to drag me out in an emergency, a retreat was indicated. The passage did have an encouraging draught at times, but it certainly wasn't howling out of the duck, so perhaps it comes through higher up in the rift (which was too narrow to enter). I didn't have the patience to exit the first duck with the same slow and cautious approach I'd used on entry, so halfway through I switched tactics to treat it as a sump dive. This was a mistake (since I was lying on my back) and I ended up snorting a large quantity of water up my nose and down my throat."

This point is lower than 97m altitude - about level with the sumped resurgence Nacimiento del Campiazo (site 1106) approximately 1km away. To the southeast from the base of the pitch, the passage is a winding crawl for about 50m to the top of a 4.7m free-climbable pitch. From the base, the passage continues through a very tight tube for 3m which would become impassable with any water. Beyond the route continues in typical "Yorkshire streamway" to a large canal which apparently ends at blank walls. (This was explored in August 2007 when the water level in this area of the cave was a metre up on that seen in the previous year). An inlet has been pushed through a wet bedding and up into the large Dolmen Chamber with dangerous rocks.

   In June 2021, the Quebraduras windfarm proposals were published with generator positions, access roads and power line to Fuente las Varas. A 10-page Word doc was written outlining possible effects to the caves. This site (2519) could be affected by pylon foundations being built over the cave.

   Link to entry in the Cave Diving Sump Index.

Reference: anon., 2006d (summer logbook); Corrin Juan, 2007 (survey and photo); anon., 2007b (Easter logbook); anon., 2007d (summer logbook); Corrin Juan and Smith Peter, 2007; Corrin Juan, 2007a; Ruiz Cobo J and Muñoz Fernández E, 2013; anon., 2016c (summer logbook); anon., 2025a (Easter logbook)
Entrance pictures : Easter 2006 - Photos around the entrance : 2007 - Before pushing the canal : Distant views of the entrance
Underground pictures :
Easter 2006 - general shots : 2007 - Pushing the canal on an airbed. : 4m Pitch off Cascade Chamber
Video : slide show (9Mb) : Exploring p4 off Cascade Chamber, April 2025 (YouTube)
Detailed Survey : pdf file (Easter 2007); pdf file (summer 2007) : pdf file (Easter 2025)
Line Survey :
On area survey :
Survex file : stand alone (Amended magnetic declination December 2013 to align with Eur79 grid and coordinates altered to fit ETRS89 datum, April 2014.) 
on Fresnedo-centred area 3d file (Amended magnetic declination December 2013 to align with Eur79 grid and coordinates altered to fit ETRS89 datum, April 2014.)
Passage direction rose diagram: 1/7/2018