Lac souterrain de Saint-Léonard
Cave diving in Switzerland
- Max depth
- 13 m
- Type
- Backmount
- Certification (estimate)
- Cavern
- DPV
- Not DPV-suitable
Europe's largest natural navigable underground lake, in gypsum. Discovered in 1943, boat tours since 1949; the water level dropped after the 1946 earthquake.
More about Lac souterrain de Saint-Léonard
Signed-in divers also see:
- Whether this site fits everyone's certification, gas and gear
- Access, parking and the route from the road
- Exact map pin and navigation
- Depth profile and sumps
- Configuration advice
- DPV suitability
- Driving times from your stay and a plan with the AI instructor
News
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Current conditions
Visibility, flow and water levels change quickly. Right before your dive, check what other divers report:
- Taucher.Net – forum: Flaschenfüllen beim Höhlentauchen in der Schweiz ↗
German-language diving forum; thread on fills and suitable sites for cave divers in Switzerland (2019).
- Sorgente Bossi (sorgentebossi.ch) ↗
Manager's site: registration, booking and regulations for the Sorgente Bossi.
- Rinquelle (rinquelle.ch) ↗
Site of a local cave diver with survey, videos and contact.
- SWISS DIVERS – Tauchplätze der Schweiz ↗
Swiss dive-site directory and diving news (German), by lake and region.
- Cavernes ↗
Journal and archive of caving in French-speaking Switzerland, with reports of sump dives in the Jura.
Plan a cave diving trip to Switzerland
Enter your team, with certifications, gas and configurations, and see right away which caves fit. With driving times from your stay, fill stations and an AI instructor who thinks along.
Certification requirements, configurations and trimix depths are estimates for planning. Always check them locally and dive within your training. Compiled from web research (sorgentebossi.ch, Arogno municipality, Catasto Speleologico del Canton Ticino, sergioveri.com, Corriere del Ticino, LiberaTV, Ticinonline, Tauchclub Seeteufel, Plattform J, WeDIR.ch, taucher.net, dark-team.de, the 'Der Bätterich' presentation, rinquelle.ch, Erlebnis Geologie, Le Scaph, Lac souterrain de St-Léonard, Wikipedia, BAFU, SAC/Spéléo-Secours, GTÜM, swiss-divers.ch, kohmann.ch, Luftverbund, SSI, Tiefenstein, Divepad; Sept 2026). Pins from the Ticino cave register (converted from Swiss grid coordinates), Wikipedia and a club page (Bätterich car park); two sites have no pin. ~ = estimate. Rules change — check locally.