Tresviso 2017 – the May Bank warm up

Over the weekend of 28th April to 2nd May, a team of 5 cavers are going out to Tresviso with the brave (or foolhardy) plan to set up the Death Race 2000 underground camps, ready for the summer trip.

Die Hard Traverse Chris Jones 2016
Die Hard Traverse, Cueva del Nacimiento – Chris Jones 2016

Over recent years the time and effort spent getting people and equipment to the furthest reaches has caused significant lost time that would be better spent pushing leads. A team of 4 people, with large packs of underground camping, drills and rope can take anywhere from 12 to 18 hours to get to the Jurassic World section of the cave. However, a team with minimal equipment can get to the Death Race camp in around 4 hours.

In 2016 a number of ‘base camp’ items were left at Death Race, including sealed food and sleeping bags. The May trip plans to take some more equipment in to be left in situ ready for the summer trip.

The trip will only really have 3 days in the field, 2 of which spent underground in Nacimiento. Weather is currently good, with minimal snow over the past few months and only light showers of late.

Updates to follow, where possible….

Phil Walker, Chris Jones, Hannah Moulton, Gareth Davies, Alex Burton-Johnson

agua surface overlay
Cueva del Nacimiento – Google Earth Surface Overlay (2016)

Tresviso 2017 Overview

Tresviso 2017 Overview

The latest Tresviso Caving Expedition is planned for this summer and once more a blog will be attempted. Additionally, a long weekend pre-expedition trip is planned.

Looking North from San Carlos (Andara)
Looking North from San Carlos (Andara) – Phil Walker 2016

Overview & brief history:

The Picos de Europa is a range of mountains 20km inland from the northern coast of Spain, forming part of the Cantabrian Mountains. It consists of three main areas, the Central, Eastern and Western Massifs. It was the Eastern Massif that drew the attention of Lancaster University Speleological Society (LUSS) in the early 1970s.

location

The early years were spent pushing Cueva del Nacimiento (Cueva del Agua) located at the foot of the mountain range. Over the years this was pushed to around the 11km and +300m mark, but after several years the cave was abandoned as the major routes sumped and no continuation could be found. LUSS turned their attention to the Andara region higher up the mountain range and sought caves that would drop into the Nacimiento system and create a record-breaking 1500m through trip.

They eventually found a number of deep caves around this ‘top camp’ area. Sara, Tere, Flowerpot and the -1169m deep Sima 56 (at the time one of the deepest in Spain) were all pushed to respectable depths.

Many years were spent pushing the top camp systems but the way through remained elusive.

The idea was always to connect Sima 56 through to Nacimiento, a through trip of around 1500m vertically and ~5.9km horizontally. Exploring Sima 56 downwards is an incredibly large undertaking (approx. -1129m deep, lots of pitches).  Upwards from Nacimiento will also be difficult, the furthest point in 1986 was a +200m ascending ramp, followed by some avens with surface debris. Depending on what you look at, the difference between Sima 56 and Nacimiento is about 3km, but they have overlapped height wise.  Some of the known undescended shafts on the Sierra del a Corta are right above the furthest point of Nacimiento.

Naciemiento Streamway (2016)
Cueva del Nacimiento Streamway – Russ Brooks 2016

Recent expedition activity

In 2005 a small SWCC trip found a number of undescended shafts on the top of the Sierra del a Corta. Al2 remains unfinished.

In 2009 a joint SWCC & SBSS trip further explored Cueva del Entre Cuetos, located on the Sierra del Corta. The 1996 limit at -100m was passed and the cave extended down a number of new pitches to an immature stream way that may repay a further visit

In 2010 SWCC and SBSS spent 10 days examining leads around the Sierra del Corta and Valdeladiezma, including a number of promising draughting shafts. (T69, T507, T504). Torca Septrin, on the Pico Boro, was also revisited and extended for a few more metres and remains an ongoing project.

In 2011 SWCC Cueva del Nacimiento was successfully bolted and re-rigged all the way through the cave and up to the current limit of exploration in the final Death Race 2000 chamber. T69 was investigated further with some digging revealing the head of an un-descended shaft.

In 2012 SWCC spend 3 weeks further exploring Cueva del Nacimiento, including a successful dive of the Upstream Sump, not visited since 1986, extending the sump further and deeper. Death Race 2000 was climbed and a series of pitches descending back toward stream level was discovered.

In 2014 SWCC and others further explored leads in Cueva del Nacimiento and revisited Torca Septrin

In 2015 the Tresviso Caves Project spent 2 weeks exploring Cueva del Nacimiento and discovered new extensions above the Death Race 2000 chamber (Die Hard and Jurassic World). Additionally, a new large sump (Pena Colada sump) was discovered at the bottom of the Death Race steamway

In 2016 the Tresviso Caves Project spent 2 weeks exploring Cueva del Nacimiento and climbed a number of avens in the Die Hard – Jurassic World area. Additionally, Pozo Natacha (in the Mazarassa mine area) was rigged ready for the next expedition.

Previous reports are available here: http://www.trevisocaves.info/reports.html

The Wet Aven (Nacimiento)
Arwel Roberts on the “Wet Aven”, Teeth of Satan, Cueva del Nacimiento – Joe Daniels 2015


The Plan

The 2017 expedition will be undertaken over 2 weeks from July 8th to July 22nd 2017.

The expedition has a number of objectives. The following are a few primary objectives:

Cueva del Nacimiento – Die Hard – Jurassic World

Various Leads

  • Multiple climbs in Jurassic World
  • Multiple climbs in Die Hard

Cueva del Nacimiento – Pina Colada Bypass

A 3-10m rift heads off from the Pina Colada sump

Cueva del Nacimiento – Teeth of Satan – Wet Aven

The 2017 expedition partly continued climbing a promising aven, part way up the Teeth of Satan ramps. The aven requires completing with a possible continuation at the top.

Cueva del Nacimiento – Passages above Dan’s Big Room

Unexplored sections of passage near the 1970’s Terminal Chamber.

Middle Camp

Approx. 200m above the furthest point in Nacimiento is the Sierra del Corta. A heavily wooded area with a number of promising leads, that could potentially drop into Nacimiento and provide an easier route into the back to aid exploration

Andara (2016)
Minas de Mazarassa, Andara – Russ Brooks 2016

T554

The 2014 trip re-discovered a large 100m shaft on the Sierra del a Corta. Another good central location for dropping into Nacimiento, this requires some digging at the bottom

Al2Discovered in 2005. A drafting shaft not yet bottomed. Jurassic World in Nacimiento appears to be heading directly towards this site

Secondary Objectives: 

Time and resources permitting there are a number of secondary objectives that will be attempted:

  1. Pozo Del Castillo / Natacha. Reinvestigate the possibility of resuming exploration of the Castillo system, currently at -293m .
  2. Locate draughting surface entrance, close to 80m aven beyond Sump 1 in Cueva del Marniosa
  3. Upstream series in Cueva del Marniosa. Large black voids above the streamway.
Crystal Spear Cave (2016)
Martin Groves, Crystal Spear Cave – Jason Gotel 2016

A few updates

Cueva del Nacimiento

Draughting hole at end of Jurassic World, was hammered and dug out for 4 hours. No progress made. Easy sand gave way to large sections of calcite. Long term dig.

Dinosaur Aven, climbed to a height of 50m, narrow to impenetrable draughting crack

Iam Not into Yoga another aven above Die Hard climbed to 50m

Joes Crack, newly discovered pitch near main Death Race chamber. 20M heading downwards away from Death Race. Draughting

Howling Hole, small aven above hole climbed, minor gains

Cueva del Marniosa – Diving bottles retrieved

New cave discovered near Tresviso, approx 180m long with a few undescended pitches. Appears not to have been explored.

Pozo Natacha – Still being rigged. French survey and rope lengths are completely wrong. Proving a challenge

DR

Pozo Castillo

One of the secondary objectives of the expedition is to revisit the Pozo Del Castillo cave on the Andara mountain range.  This cave, and a number of interconnected caves and mines were explored initially by the French Les Speleois Dromis (LSD) club in in the early 1980’s.  The written report at the time talked of a ‘roaring sound’ at the limit of exploration but a return in 1987 by LUSS reported that part of the route through, in the early part of the cave, had collapsed with snow and rock.

The depth potential to Cueva del Nacimiento is approx. 1360m and with the encouragement of a roaring noise, possibly water or a draft, it has always been an interesting site to revisit.  A few attempts in the past year have returned with vague descriptions of ‘yes it’s blocked’ to ‘we may have been in wrong cave’, so it finally came for me to go up the hill and put my mind at rest.

A large group of us went up the hill, 3 cavers (Phil, Martin and Joe) and 4 others (Duncan, Russ, Nicola and Emma).  AS Castillo is made up of a number of entrances; Pozo Castillo, Pozo Natacha, Segura 2 and Clockwork Pot, the tentative plan was for the others to scout out, log and photograph the next entrance ready for the cavers.  My intention was that if Castillo was blocked the other entrances might provide a way in to the system that dropped beyond the collapse.

Straight away we started to hit the same problem with ‘co-ordinates’ as previous years.  Original co-ordinates from the 70’s have an error in them so can’t be fully trusted without converting and adding some degrees.  Official co-ordinates from the various official guidebooks seem to either have used the conversion (but without the additional degrees) or used a set area as the official position and used for the same cave. The most accurate way appears to be a combination of open street map inputted co-ordinates (quite possibly scraped from the expedition website anyway) and a handwritten LUSS map from the 80’s!

The Pozo Castillo entrance was found quickly, after a few detours, and is a large open shaft of about 15m.  Joe bolted down this and myself and Martin followed.

GOPR0315-0002

 

The bottom of the shaft is still in daylight being about 15m x 8m wide with a large snow plug in the middle.  Under one wall is a crouching size hole that leads to another 15m pitch.  This was bolted and dropped to enter the start of a complex series of mine passages.  A couple of side passages were ignored as we followed the known description to a ‘crossroads’.  From this point access to 3 of the entrances could be established.  Firstly I went straight ahead, this lead through 200m of walking size mine passage to exit on the side of the hill, overlooking the Lake Depression.  This is Segura 2.  Unable to shout to the above ground team, I went back into the cave.  Right from the crossroads, leads to another junction with an old wooden miners ladder in place.  This is Pozo Natacha.  We attempt to go up here for a while to try and find the entrance to Pozo Natacha from below, but after a few dodgy climbs we started to encounter proper pitches (about 2 from the entrance proper).  Back at the junction the other route lead to a large 30m shaft (the top of which was encountered higher up when trying to climb out of Natacha.  This was interesting, draughty and the first natural cave passage encountered in the system.  A known system again, running almost parallel to Castillo, to a similar depth and similar reports of drafts at the end.

GP010315-0001

Finally, we then took the left hand route at the crossroads and went in the Castillo system proper.  Around 200m of impressive min passage, with numerous stacked deads leads to a final flat out crawl.  The reported blockage was described as here and we quickly found it.  A small slumped passage requires a flat out crawl to a small chamber with a snow plug.  Looking up is a rather scary affair, with two car engine sized boulders perched and a bit of rotten timber and the snow plug.  The left hand side of the snow plug has started to melt and it possible to look down into the chamber further and see more of the snow plug.

GP040315-0001-0001

 

No way we were going to get through this today and some discussion was needed on whether we should even attempt it.  We exited the cave, regrouped and returned back home

Segura 2 – located and logged.  Safest and easiest way into either Pozo Castillo and Pozo Natacha.

Clockwork Pot – not located, co-ordinates inaccurate from all sources.  Would need to return and use approximation from the Castillo full survey and descriptions.

Pozo Natacha – entrance not located / confimed but enterable via Segura 2.

Pozo Castillo – still blocked, the snow is possibly melting.  Would need to check how stable the boulders are and whether it’s only the snow holding them up

 

 

 

 

 

Cueva del Nacimiento

The rising roaring noise in the distance marks the arrival at the Hole in the Wall, a small hole in the side of the cave passage that channels all the air coming down through the cave. Looking into the hole, is like sticking your head out of a car window…. with a face full of grit for good measure.

A small pitch soon follows and then once more the cave climbs up, until leveling out briefly at the sump. It’s at this point that I notice my chest harness has snapped, bit of a sobering thought as I’d just been pruskking up the last few climbs. The sump is more of a duck now, and the level has remained the same as last year, so we get through relatively dry. A couple more pitches and we reach Consort Hall, it’s taken about 4 hours, so quicker than we were expecting but a slow dawning of realization to the task we have undertaken.

Lunch is eaten and we set off once more, heading toward the back of the cave. The next few parts of the cave are probably the best, large, well decorated passages that slowly head up through some more climbs into Dan’s Big Room. From here we gradually climb down once more towards the start of the climbs for the Teeth of Satan and the route onto the stream way.

None of us have been to the stream way before, so armed with a 1979 map and various contradictory descriptions we climb up and over an obvious calcite blockage and into a large passage heading downwards. Gradually a rumbling can be heard in the distance and we pop out into a large stream way with deep pools. It’s great to be at the stream way, but it becomes quite obvious we cannot move up the stream way to the sump without full on immersion in the water.

We try a few different routes around the stream but they all lead to more deep pools. Eventually we backtrack around 50m up the passage to what initially looks like a rope coming in from the ceiling, but turns out to be 6mm dive line. Martin and madPhil make a start on climbing the wall once more while myself and Dave return to the calcite climb to fetch the rope and drill.

On returning to the climb, the others have returned having reached the sump via this route. The drill and rope is hauled up so that they can get down! Diving lead is dumped at the foot of the climb and we start the slow trip back out. The landmarks pass quickly and we are back at Consort Hall in about an hour and half. A bit more food and we set off for the entrance. It all seems a lot quicker on the way out and we reach the entrance at 9:30PM. Total cave time of 12 hours 30 minutes. Slog up the hill and dinner just before going to bed.