Hérault and Gard · about 12 km from Saint-Martin-de-Londres
Source du Lez
Closed to divers
Montpellier's drinking-water catchment inside a protection perimeter; no diving permits are issued.
- Max depth101 m
- CertificationFull cave
- SpecialExperienced divers
Diving and fills
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Fills nearby
- Fill stationLa Palanquée New'sNitrox and oxygen per a 2018 forum post; trimix and pressure: askRoute ↗
Now at Source du Lez
What it looks like
All 1 videos and posts
Videos and posts
From other divers, via YouTube, Instagram and Facebook. They only load when you click; after that, Google's or Meta's privacy rules apply.
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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
The karst spring of the Lez is Montpellier's main drinking-water source, with underground pumping since 1982. Its flow is ~2.6 m³/s on average.
Profile and sections
The karst spring of the Lez is Montpellier's main drinking-water source, with underground pumping since 1982. Its flow is ~2.6 m³/s on average.
Exploration: 1949 first dive (-18 m), 1972 320 m / -52, 1979 536 m / -75. In 1990 -101 m was reached while pumping had lowered the water level by 27 m.
- Depth and profile
- Chaotic entrance, passage at -20 m; side branch to -52 m; ~420 m horizontal, then a shaft to -75 m and a fracture to -101 m; explored to 536 m, ~600 m of passage
- Configuration
- Not applicable: diving is not permitted
- DPV: Not DPV-suitable (estimate)
- Not applicable: closed.
Who can dive where
- At least Full cave
- Configurations: Backmount / twinset / Sidemount / CCR / Small cylinders / no-mount (speleo sumps)
- Configuration unknown — research beforehand
- Goes down to 101 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
Inside the protection perimeter of the drinking-water catchment, ~3 km off the D17 beyond the Prades-le-Lez roundabout. No access for divers.
Around Source du Lez
Fills1 fill station · 22 km
La Palanquée New's
Boulevard Frédéric Fabrèges, 34250 Palavas-les-Flots
Nitrox and oxygen per a 2018 forum post; trimix and pressure: ask
Mon–Fri 9:00–19:00, Sat 9:30–12:30 and 13:30–19:00, closed Sun (2026)
Large dive shop on the coast near Montpellier (~1 h from Ganges, estimate). Its own site does not mention fills: call ahead. In 2018 a local diver called it the only place around Montpellier for nitrox and O₂.
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