Pozo Azul
Grupo Espeleológico Edelweiss gives more than 13,700 m after the August 2015 campaign; Showcaves lists 13,755 m with dimension data dated 2019. Showcaves lists sump 2 as 5,160 m long and 71 m deep (2019 data); the 2019 expedition report mentions a turnaround at about 60 m in sump 2.
A blue spring pool in the Rudrón valley at Covanera, Burgos, that opens into a chain of six sumps. Expeditions led by British and Spanish divers had raised the cave's development to more than 13.7 km by 2015.
The Pozo Azul is a small, intensely blue spring pool a short walk up a side valley from the village of Covanera, beside the Rudrón river. Beneath it lies a long resurgence cave made up of six sumps separated by air-filled galleries; the first sump is about 700 m long and is followed by a 300 m deep-water canal, according to a 2019 expedition report.
Divers of the Grupo Espeleológico Edelweiss of Burgos began exploring it in 1964 with home-built and early commercial equipment. Later Spanish groups pushed the first and second sumps, and from 2002 British diver Jason Mallinson extended the second sump far beyond 1.9 km at depths of 60 to 70 m.
International expeditions, many coordinated with Spanish cavers, continued into a third, fourth, fifth and in 2015 a sixth sump, reached only after many hours underwater. The 2019 Pegasus Caving Club report describes dives of several kilometres with a temporary underwater habitat for decompression, and attempts to radio-locate the far reaches.
Showcaves notes that the water-filled cave behind the spring is accessible only to cave divers; its far reaches are expedition territory.
Water, stroming en overstromingen
A resurgence feeding the Rudrón. Sump 2 is reported to reach depths of about 60 to 71 m, and divers have used scooters and long staged dives to reach the far sumps.
Waarom het belangrijk is
In 1966 the Edelweiss divers' 200 m penetration was described as a world record for underwater caving; by 2010 the cave hosted one of the longest cave-diving penetrations then made, and it remains Spain's best-known long sump system.
Omstandigheden
Typical only. Reaching the far sumps requires long staged dives with decompression support.
Gebruikelijke ranges uit gepubliceerde bronnen, geen actuele omstandigheden.
Survey- en verkenningsgeschiedenis
| 1964 | Joaquim and Pere Plana of the Grupo Espeleológico Edelweiss make the first dives. [4] |
| 2002-09 | Jason Mallinson extends sump 2 to about 1,950 m at 60 m depth. [3] |
| 2015-08 | Mallinson finds and dives a sixth sump, raising the cave's development above 13,700 m. [1] |
| 2019-08 | A Pegasus Caving Club team uses an underwater habitat and radio beacons to support dives towards the far end of sump 2 (Tipperary). [2] |
Ingangen en duiklocaties
One entrance, the Pozo Azul spring pool.
Voor oriëntatie, niet voor navigatie. Holle stippen zijn bij benadering.
Elk gegeven op deze pagina, met zijn bron (12)
| Gegeven | Status | Bron |
|---|---|---|
| After the August 2015 campaign the cave's development rose by about 700 m to more than 13,700 m. | Geverifieerd | [1] |
| The 13,700 m figure follows the campaign of the second half of August 2015. | Geverifieerd | [1] |
| Showcaves lists a total length of 13,755 m with dimensions dated 2019. | Gemeld | [3] |
| Sump 2 is listed as 5,160 m long and -71 m deep.Secondary source; the 2019 expedition report mentions depths around 60 m in sump 2. | Gemeld | [3] |
| Divers of the GE Edelweiss began diving in the Pozo Azul in 1964. | Geverifieerd | [4] |
| In 2015 Jason Mallinson dived a sixth sump, swimming 60 m at 12 m depth; sumps 5 and 6 are separated by 600 m of air-filled gallery. | Geverifieerd | [1] |
| Sump 1 is 700 m long followed by a 300 m deep-water canal. | Geverifieerd | [2] |
| Showcaves states that Joaquín Plana's 200 m penetration in 1966 was a world record for underwater caving and that a 2010 expedition achieved 8.8 km of underwater travel. | Gemeld | [3] |
| Water temperature is listed as 11 °C. | Gemeld | [3] |
| The site is listed as open with no restrictions and free of charge (2022 data).No official access source found; this concerns visiting the spring, not diving. | Gemeld | [3] |
| Coordinates of the spring are listed as 42.735772, -3.795994. | Gemeld | [3] |
| Coordinates of the spring are listed as 42.735772, -3.795994. | Gemeld | [3] |
Geverifieerd: vermeld door een officiële of primaire bron die we hebben geraadpleegd. Gemeld: alleen afkomstig van een secundaire bron. Bronnen spreken elkaar tegen: de noot geeft beide versies. Mogelijk verouderd: de nieuwste bron die we hebben gevonden is oud.
In eigen woorden geschreven op basis van bovenstaande bronnen. Een correctie melden