154 Cueva 77A
Secadura VN55779957 Alt. 53m  Length 384m Depth 5m

Updated 13 February 1998; 19th February 1999; 23rd February 2001

To the west of the main rising in Secadura, Los Boyones (site 117), the cave emits a good draught.

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.

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.

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)
Entrance picture :
Underground picture(s): Upper chamber 1  2  Entrance passage
Detailed Survey : 1:500
Line Survey :
On area survey :
Survex file :