Updated 13 February 1998; 19th February 1999; 23rd February 2001; 14th May 2006; 20th, 24th September 2012; 30th June 2018; 12th May 2023

To the west of the main rising in Secadura, Los Boyones (site 117), the cave emits a good draught. The original entrance is just inside the grounds of the pumping and treatment station. The second and third entrances are on the wooded hillside about opposite the end of the elevated walkway at the resurgence.

A walk-in entrance, partly covered in vines leads to a small chamber and choke. A short grovel through a bedding drops into several twisting canyons which lead to deep water. There are also various small crawls here which form a complex series of passages.

On the left hand side of the entrance chamber a narrow rift descends to deep water but in summer '96 a tight climb up was pushed to lead to a 350m extension which appears to be related to Los Boyones.

By following an obscure route between boulders a low passage is entered which links to a large but low break-down chamber beneath what appears to be phreatic development. An aven half way across the chamber has been climb to a choke containing tree routes and live snails whilst at the back a crawl leads to a draughting rift which needs digging. All side passages on the right apparently end in deep water but the first may be traversed on the left and a high rift gained via a short climb. Following the draughting rift up past several side passages containing (dangerous) pits of deep water a low passage is entered to one side. A low squeeze gains a bigger area and eventually this ascends a calcite ramp into a large phreatic passage.
In 2012 a hands and knees crawl with the occasional flat out section ended at 2 new entrances, the northern, Rite Now! and the southern, Rite Here!

This closes down to the north and east but three ways off exist to the south. The highest two are reached by climbing up but both end after about 20m in chokes, with the top passage coming extremely close to Kids' Cave (site 909).

Shortly before the calcite ramp a rubble-filled crawl reaches the base of a very big, dangerous choke. More deep water exists to the right but a small way off to the left enters a number of phreatic tubes. Several get too tight or end at pits into deep water but after a right turn at an obvious junction a very draughty area is reached. Straight ahead a bedding gets too low (but could be dug), while a small, muddy pitch down, requiring one ladder, gains a sumpy chamber. In one side there is deep water but the way on with the draught appears to come from under a large block which doesn't look very hopeful.

An investigation of the cave in 1997 found that a passage previously marked as deep water was now full of cobbles.

The cave was revisited on 6th April 2023 but it is unclear if any new passage was visited. A description in the Easter 2023 logbook outlines what was visited around the "tight climb" area (?).

Link to entry in the Cave Diving Sump Index.

References: anon., 1977b (logbook); Corrin J S and Smith P, 1981; anon., 1996a (Easter logbook); anon., 1996b (logbook); Corrin Juan, 1997a (survey and photo); Corrin Juan, 1997b (survey); anon., 1997b (logbook); anon., 2012d (summer logbook); Corrin Juan, 2013a; anon., 2023b (Easter logbook)
Entrance pictures : yes
Underground picture(s): Upper chamber 1  2  Entrance passage  2006 visit
Detailed Survey : 1:500 (1997) : updated 2012
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.)
Passage direction rose diagram: 30/6/2018