Northern Spain · about 8 km from Matienzo
Fuente Aguanaz
- Max depth7 m
- CertificationFull cave
- SpecialExperienced divers
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
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Videos and posts
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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
S1 was passed in 1995 in 5–6 m visibility; some inlet sumps often have zero visibility. An entrance constriction was removed in 2018.
Profile and sections
S1 was passed in 1995 in 5–6 m visibility; some inlet sumps often have zero visibility. An entrance constriction was removed in 2018.
Fuente Aguanaz is the outlet of the Matienzo karst (water traced from sinks ~6 km away), averaging ~951 l/s. It is a drinking-water source for Santander. It has been explored by the Matienzo Caves Project.
Practical: notify 112 before entering the cave (Cantabrian rule) and get in touch with the Matienzo Caves Project.
- Depth and profile
- S1 35 m / -5 · S2 25 m · several further short sumps (e.g. 15 m / -2.5 and 45 m / -7); cave 5,721 m, 43 m vertical range
- Configuration
- Small cylinders / sidemount; sump diving in an active cave
- DPV: Not DPV-suitable (estimate)
- Short sumps in a cave with swimming and boulders
Who can dive where
- At least Full cave
- Configurations: Sidemount / Small cylinders / no-mount (speleo sumps)
- Goes down to 7 m (trimix or deco may be needed)
- Experienced divers only
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
Resurgence by a pumping station; the top entrance starts among boulders and needs swimming along the main passage before the sumps.
Around Fuente Aguanaz
Fills2 fill stations · nearest 13 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 60 km
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