The 2012 Tresviso expedition was undertaken with collaboration between a number of UK based caving clubs and the Spanish AD KAMI
This year we concentrated on the resurgence cave of Cueva del Nacimiento, a 12 km cave system with a height gain of over 400m. The catchment of this cave totals 37km2 and, if linked with known entrances high in the Eastern Massif, would have a potential 1500m deep underground traverse.
The main effort was to dive the main upstream sump of the system, a dive not attempted since 1986. This sump, a good 5 hours caving into the cave, is seen as a major route towards the high feeder systems of the Eastern Massif.
In addition, leads further into the same cave, around the area known as “Death Race 2000” were pushed in the hope they offer a potential dry route into the mountain
The main objective of the 2012 expedition was to mount a dive on the main upstream sump in Cueva del Nacimiento and attempt to climb the avens located in the Death Race 2000 area. Both of these objectives and more were met with great success.
Far Upstream Sump
The upstream sump was extended for another 80m and followed to a depth of -46m. The technical challenge of diving at this location marks this as a major achievement and the continuing passage heading off into the mountain is a tantalising prospect for the future.
Death Race 2000
About 700m of new passage and over -150m depth was explored; a significant achievement given the remoteness and technical difficulty of exploring in this area. A number of leads remain in this area, including the undescended pitch. We also see the Death Race 2000 stream way heading in a quite unexpected direction, possibly indicating a change in the geology of the cave system.
Around 615m of new passage was found in the nearest reaches of Nacimiento with at least a dozen new leads added proving that there is still new cave to be found even close to the entrance.
|Alan Braybrooke||South Wales Caving Club||UK||2012||Tresviso 2012|
|Chloe Francis||South Wales Caving Club||UK||2012||Tresviso 2012|
|Duncan Hornby||South Wales Caving Club||UK||2012||Tresviso 2012|
|Krysia Groves||South Wales Caving Club||UK||2012||Tresviso 2012|
|Martin Groves||South Wales Caving Club||UK||2012||Tresviso 2012|
|Phil Walker||South Wales Caving Club||UK||2012||Tresviso 2012|
|Anthony Galley||Nottingham University Caving Club||UK||2012||Tresviso 2012|
|David Smith||Nottingham University Caving Club||UK||2012||Tresviso 2012|
|Haydon Saunders||Nottingham University Caving Club||UK||2012||Tresviso 2012|
|Laurence Brown||Nottingham University Caving Club||UK||2012||Tresviso 2012|
|Martin Trerise||Nottingham University Caving Club||UK||2012||Tresviso 2012|
|Phil Stringfellow||Nottingham University Caving Club||UK||2012||Tresviso 2012|
|Simon Woolhead||Nottingham University Caving Club||UK||2012||Tresviso 2012|
|Derek Cousins||Lancaster University Speleological Society||UK||2012||Tresviso 2012|
|Mark Sefton||Lancaster University Speleological Society||UK||2012||Tresviso 2012|
|Matt Jones||Bristol Exploration Club||UK||2012||Tresviso 2012|
|Phil Rowsell||Bristol Exploration Club||UK||2012||Tresviso 2012|
Thanks also due to Ian Benson, Colin Boothroyd, Dave Checkley, Ken Daykin, Hugh Firman, Carolyn Ginnevar, Howard Jones, Jez Peterson, Rupert Skorupka and Jim Thomson.
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