Tresviso Caves Project

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T591: Torca de la Riega Cericiega

(La Cuidad del Drenaje, T24, Torca 24, Town Drain, 17)
Area:Invernales de la Caballar
East, North:359088, 4790232 (nearby)
Coordinate Quality:GPS
Long, Lat:-4.7358902142189, 43.251698400689 (map)
Elevation (m):1151
Length (m):571
Depth (m):-170
System:
Active Lead:
Survey Available:

Approach
From the head of the Sobra Valley (park in layby) head west of the col and then approx. 350m in a southerly direction to obvious depression. Sink is on left following the obvious line of the valley, surrounded by trees.

Entrance
Large open depression surrounded by trees.

Description
A large open depression surrounded by trees.The shake hole is split by numerous rock bridges with two obvious descents, right as you look south is a 50m pitch, left is a 20-30m scramble, aided with a hand line to floor of the open shake hole. Continuing down leads to a 25m pitch (split into 10m, 10m and 5m sections) to the floor of the main chamber (15m x 25m x 25m). From the main chamber a number of passages lead off in various directions. Heading east an easy scramble down leads to a smaller anti-chamber that must take the majority of water in wet conditions. At the north end of this chamber is small climb down into a water worn passage which after 5m drops into a small mud and boulder choked chamber. A small u-bend squeeze it the current limit of exploration. A 4m climb above here leads through a small passage.
Heading west from the main chamber is a 10m pitch that can be free climbed through a small opening on the left. This leads directly into another obvious water sink with mud and flood debris evident. A small crawl to the left leads to a mud chamber with no apparent way on.
A small climb above here leads through a small passage to 10-20m of old stream passage. This leads out into a larger fossil rift and the head of a 17m pitch. From the base of the pitch a short climb leads to the head of a 20m immediately on to a short fossil ramp and a balcony over a broad smooth sided circular shaft. From the flat base a short phreatic stream way quickly leads to the head of a 30m pitch.
The far side of the bottom of this larger shaft leads immediately on to a soft fossil ramp and a balcony over a broad chamber. The base of the chamber is dominated by a mound of mud and debris washed in from above.
Circling either side of the mound leads down though to a mud filled chamber cut though by floodwater. This leads to a low cobbled crawl at the far left hand side of the chamber which can be followed for 20m to a small chamber. Above the crawl to the right can be found a small 3m shaft with a cobbled floor (this was not explored due to lack of rope).
The far right hand side of the chamber leads to a wide inclined rift which can be climbed for 5-10m before ending in an aven (not climbed due to lack of equipment).
A single set of old rusty spits were in evidence on the pitches.

Reference
Colectivo Asturiano De Espele'logos CADE. (1983) Agrupacion De Espeleologia Canfranc ADEC (1988) Tresviso Caves Project 2015 Picos de Europa, Ascensiones a las cumpres principales y 20 traversas selectas, by Miguel Angel Adrados, 1997,

Images
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