The 2016 expedition was undertaken with collaboration between a number of UK based caving clubs and the Spanish AD KAMI club, under the name of the Tresviso Caves Project.
As per previous years the majority of work was concentrated on the resurgence cave of Cueva del Nacimiento, a 12 km cave system with a height gain of over 495m from the entrance. The catchment of this cave totals 37 km2 and, if linked with known entrances high in the Eastern Massif, would create a potential 1500m+ deep underground traverse.
The main effort in 2016 was to continue work in the furthest reaches of the cave, around the areas known as Death Race 2000, Die Hard and Jurassic World. A series of steep ramps lead to the highest known points in the cave and a number of leads were investigated at these highest points.
The 2016 expedition has continued to build on the successes of previous trips advancing exploration in line with the expedition objectives and discovering a number of new leads and over 1km of cave was surveyed on the trip.
Cueva del Nacimiento
Over 500m of new passage was discovered and surveyed in Cueva del Nacimiento and a number of new leads identified. In addition, large sections of the cave were re-rigged with newer rope and a lot of old rope and rubbish in the cave was removed.
The main aven in Jurassic World was climbed for over 50m high. There is a slight draught at the top but further progress would require chemical persuasion.
The Wet Aven
The aven was climbed for over 50m to a number of small pitches entering the aven. A draught and constriction at the top holds promise for further extensions next year.
I’m Not into Yoga
Aven climbed for over 60m to tight continuation.
Rift close to Death Race 2000 camp was descended for 20m, the passage continues and a draught emits from the passage. Very promising lead
The dig at the furthest point in Nacimiento resisted attempts to pass it. This would require a long term assault and manpower.
Sand or Smeg Chamber
Large chamber, collapsed at both ends. No leads.
Main passage climbed for another 10m to a small chamber with surface debris.
I Love Horses
The previously unclimbed 11m ramp was climbed, but closed down at the top. No leads
The following provides a list of the main leads outstanding in Cueva del Nacimiento:
- Jurassic World – 4 unclimbed avens / climbs,
- Jurassic World – Sandy dig – long term digging,
- Jurassic World – Dinosaur Aven – possible continuation of main aven,
- Die Hard – 1 unclimbed avens (possible connects to Dinosaur Aven
- Die Hard – I’m not into Yoga – narrow rift at top of aven,
- Death Race – Pina Colada sump – possible dive and high level rift,
- Death Race 2000 – main aven climb remains unfinished,
- Death Race 2000 – Joe’s Crack – draughting rift continues down,
- Teeth of Satan – Wet Aven – small hole (with echo beyond) at top of avens,
- Teeth of Satan – Hellsmouth – further passages unexplored,
- Dan’s Big Room – maze of unexplored passages above,
- Parting Friends sump – second sump remains unfinished,
- Far Upstream sump – major long term deep diving project,
- Road to Certain Death sump – major deep diving project.
The expedition concentrated mainly on a reconnaissance of Pozo Castillo and rigging of Pozo Natacha.
The main way on still appears to be collapsed and has been impassable since the 1980’s. A concentrated effort would be required to clear the blockage but potentially one of the other numerous entrances in the area may provide a route past the collapse. Pozo Castillo remains a cave with huge potential. The location and direction of passage suggests it may be a feeder into a much larger system that takes all the water from Pozo de Andara (The Lake Depression).
The cave has been rigged down to the final pitch and an early trip, at the start of the next expedition, should be able to determine the potential of progression at the furthest point. The direction and current depth of the cave places it very close to the end of Castillo and most likely it will connect with the hypothesised main feeder system beyond both caves.
The following provides a list of the main leads outstanding in and around Sistema Castillo:
- Pozo Castillo – undocumented mine workings above second pitch,
- Pozo Castillo – undocumented mine workings (over 1km) before main junction,
- Pozo Castillo – undocumented mine workings on left after main junction,
- Pozo Castillo – half flooded main passage, not explored,
- Pozo Castillo – undocumented mine workings, heading up, beyond tight crawl,
- Pozo Castillo – undocumented connection to Segura 1,
- Pozo Castillo – continuation over the top of the 30m pitch,
- Pozo Castillo – Thatcher’s Squeeze. Sound of a large volume of water from beyond
- Pozo Natacha – upper series undocumented,
- Pozo Natacha – tight constriction at limit of exploration,
- Castillo II (FT17) – a possible bypass / safer route into Castillo – requires resurveying,
- Castillo III (FT16) – a possible bypass / safer route into Castillo – requires resurveying,
- T143 – on surface, just past Pozo del Castillo entrance, undescended 50m pitch,
- T147 – undescended pitches close to Pozo del Castillo,
- Blenda, Blenda II – draughting mine, north of Segura 2,
- T303 – undescended pitch, requires hammering, but may lead direct into T302 Torca del Reloj.
|Duncan Hornby||South Wales Caving Club||UK||2016||Tresviso 2016|
|Martin Groves||South Wales Caving Club||UK||2016||Tresviso 2016|
|Arwel Roberts||South Bristol Speleological Society||UK||2016||Tresviso 2016|
|Bob Clay||South Bristol Speleological Society||UK||2016||Tresviso 2016|
|Joe Daniels||None||UK||2016||Tresviso 2016|
|Derek Cousins||Lancaster University Speleological Society||UK||2016||Tresviso 2016|
|Mike Roberts||Individual||UK||2016||Tresviso 2016|
|Alberto Ortega||Grupo de Espeleologia Geologicas||ESP||2016||Tresviso 2016|
|Mesh Ashari||Cardiff University Caving Club||UK||2016||Tresviso 2016|
|Uzman Ali||Cardiff University Caving Club||UK||2016||Tresviso 2016|
|Chris Jones||Cardiff Hill Divers||UK||2016||Tresviso 2016|
|Dave Collins||Cardiff Hill Divers||UK||2016||Tresviso 2016|
|Dave Powlesland||Cardiff Hill Divers||UK||2016||Tresviso 2016|
|Emily Mackinven||Cardiff Hill Divers||UK||2016||Tresviso 2016|
|Gareth Davies||Cardiff Hill Divers||UK||2016||Tresviso 2016|
|Jason Gotel||Cardiff Hill Divers||UK||2016||Tresviso 2016|
|Dan Workman||Bradford Pothole Club||UK||2016||Tresviso 2016|
|Emma Battensby||Bradford Pothole Club||UK||2016||Tresviso 2016|
|Hannah Moulton||Bradford Pothole Club||UK||2016||Tresviso 2016|
|Nic Brooks||Bradford Pothole Club||UK||2016||Tresviso 2016|
|Phil Walker||Bradford Pothole Club||UK||2016||Tresviso 2016|
|Russ Brooks||Bradford Pothole Club||UK||2016||Tresviso 2016|
|Sam Deeley||Bradford Pothole Club||UK||2016||Tresviso 2016|
|Fernando de la Fuente Moreno||Asociación Deportiva KAMI||ESP||2016||Tresviso 2016|
|Miguel Ángel Ruiz Rodríguez||Asociación Deportiva KAMI||ESP||2016||Tresviso 2016|
Thanks also due to Howard Jones, Colin Boothroyd, Dave Checkley, Carolyn Ginnever, Toby Dryden and the people of Tresviso
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