Tresviso Caves Project

Tresviso Caves Project Gazetter

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 south from the main chamber leads, after 20m to an obvious junction.  Straight on is an unclimbed (3m) calcite climb.  Turning left leads up a 4m climb to another chamber.  An aven at the eastern end is approx. 20m high and unclimbed.  Turning north in the chamber heads through some sandy crawls to a window overlooking the previous small anti-chamber.
 
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 Espeleólogos CADE. (1983)
  • Agrupacion De Espeleologia Canfranc ADEC (1988)
  • Picos de Europa, Ascensiones a las cumpres principales y 20 traversas selectas, by Miguel Angel Adrados, 1997,
  • Tresviso Caves Project 2015
  • Notes

  • Cave 17. 170m Torca de la Riega Cericiega (CADE 1983, ADEC 1988) (X 359.2, Y 4790.5) in Picos de Europa, Ascensiones a las cumpres principales y 20 traversas selectas, by Miguel Angel Adrados, 1997, ""con … dos mapas topográficos a escala 1:25.000"".
  • Images

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