Northern Spain · about 1 km from Covanera
Pozo Azul
- Max depth72 m
- CertificationIntro to cave (first section)
- Water temperature≈ 9–11 °Cestimated, no reports yet
- SpecialDPV-suitable
Diving and fills
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Fills nearby
- Fill stationCentro Buceo PedreñaAir, nitrox and mixed gas; the team includes a trimix gas blenderRoute ↗
- Fill stationBuceo Mundo SubmarinoAir, nitrox, trimix and helium in any mix, up to 300 bar (O₂ and He analysers)Route ↗
What it looks like
POZO AZUL CAVE DIVING (BURGOS) Buceo en el Pozo Azul / Diving in the Pozo Azul 14/01/2023 CREST DIVING EQUIPTMENT FOR CAVE DIVING (POZO AZUL) Pozo Azul - diving sump 2
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Videos and posts
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POZO AZUL CAVE DIVING (BURGOS) Buceo en el Pozo Azul / Diving in the Pozo Azul 14/01/2023 CREST DIVING EQUIPTMENT FOR CAVE DIVING (POZO AZUL) Pozo Azul - diving sump 2
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Buceo pedreña
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Other people's footage, not advice: how someone else dives here says nothing about what suits your team. Dive within your training.
The dive
Visiting teams usually dive S1 to La Burbuja, a 300 m air-filled canal where S2 starts. The water is 9–11 °C year-round. Visibility in S1 can drop to ~1.5 m from diver traffic; S2 is usually clear.
Profile and sections
Visiting teams usually dive S1 to La Burbuja, a 300 m air-filled canal where S2 starts. The water is 9–11 °C year-round. Visibility in S1 can drop to ~1.5 m from diver traffic; S2 is usually clear. Trout live in the spring.
Pozo Azul is one of Spain's longest underwater caves. Exploration of S1 began in 1964 (Joaquín Plana, G.E. Edelweiss); La Burbuja was first reached in the late 1970s. Since 2001 British divers (Mallinson, Volanthen, Stanton) have explored the far reaches, and in 2014 Jason Mallinson and the Dutch diver René Houben took the total past 13 km. Beyond S2 lies 'Tipperary', a ~500 m air-filled gallery the expeditions use as their camp. The spring averages ~1,000 l/s, up to ~4,700 l/s in the wet season and as little as 34 l/s (October 2010).
Practical: Bar Muñecas in Covanera, a few hundred metres from the pool, has been the expeditions' staging post. The cave lies in the Parque Natural Hoces del Alto Ebro y Rudrón and is for certified cave divers only. Whether you need a permit is unclear — ask the Junta de Castilla y León before you go.
- Depth and profile
- S1 700 m / -21 · 'La Burbuja' (300 m air-filled canal) · S2 5,160 m / -71 · S3 3,725 m / -40 · S4 140 m · S5 100 m · S6 660+ m / -40; total >14 km; max -72 m (InDEPTH 2026)
- Intro level
- First part of S1 along the main line (roomy, to ~-21 m), within the limits of your intro certification; La Burbuja and everything beyond is full cave or expedition terrain.
- Configuration
- S1: all configurations. Beyond La Burbuja it is expedition terrain: CCR, scooter, deco habitat in S2.
- DPV: DPV-suitable
- Long, roomy sumps; the explorers use scooters in S2. Less needed in S1 (700 m).
Who can dive where
- At least Full cave
- Cavern zone / easier part: at least Intro to cave
- Configurations: Backmount / twinset / Sidemount / CCR / Small cylinders / no-mount (speleo sumps)
- Goes down to 72 m (trimix or deco may be needed)
This is how the planner decides who in your team may dive this cave. Rules your own trip adds (organizer, a mail, the AI) show with your trip.
How to get there
Free signposted car park in Covanera, then ~300 m (5–10 min) to the spring pool; the 2019 team moved gear on pallet trucks. Entry from the bank. Swimming is allowed too — swimmers are asked not to touch lines and buoys.
Around Pozo Azul
Fills2 fill stations · nearest 79 km
Centro Buceo Pedreña
Barrio La Barquería 151E, 39130 Pedreña
Air, nitrox and mixed gas; the team includes a trimix gas blender
Not stated — ask
Buceo Mundo Submarino
C/ Dr. Federico de la Lastra 3, bajo, 39770 Laredo (Cantabria)
Air, nitrox, trimix and helium in any mix, up to 300 bar (O₂ and He analysers)
Not listed — ask
SSI centre with recreational and technical courses; rents 10/12/15/18 l cylinders and 2×10 and 2×12 l twinsets. Fills for visiting divers: ask. Closest fill point for Matienzo (~30 min, estimate).
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Caves nearby3 within 36 km
News
- The 2026 InDepth State of Cave Exploration ↗
- Xesús Manteca, cave diver: 'The Pozo Azul will give work to several generations of speleologists' ↗
Access and rules change: check what applies locally right before your trip. Source: GDELT Project and the news feeds of diving magazines. Search for more news ↗ Searched automatically, last on 13 Nov 2026.
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