Grotte de Thaïs
Cave diving in the Vercors · about 1 km from Saint-Nazaire-en-Royans
- Max depth
- 97 m
- Trimix from
- 45 m
- Type
- Sidemount
- Certification (estimate)
- Intro to cave (first section)
- DPV
- Not DPV-suitable
Spring of the underground river Thaïs, which flows into the Bourne; show cave with traces of late-glacial occupation. S1 was passed in 1957; S6 was explored step by step to -97 m (1975–1998).
More about Grotte de Thaïs
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
- Warnings with sources (2)
- DPV suitability
- Driving times from your stay and a plan with the AI instructor
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Current conditions
Visibility, flow and water levels change quickly. Right before your dive, check what other divers report:
- Baptêmes de plongée souterraine à Choranche (Vercors) ↗
Facebook page about cave try dives at Choranche.
- plongeesout.ffspeleo.fr – sifons in de Isère ↗
FFS site with sheets, surveys and reports on the Isère sumps (Goule Noire, Bournillon, Cuves de Sassenage …).
- plongeesout.ffspeleo.fr – sifons in de Drôme ↗
Sheets on the Drôme sumps (Thaïs, Émergence de Bourne, Émergence du Diable, Luire …), with status and exploration history.
- CDS 38 – Comité départemental de spéléologie de l'Isère ↗
Isère caving committee: clubs, monthly meeting, cave database (Karsteau).
- FFS – École Française de Plongée Souterraine ↗
Cave-diving school of the French caving federation: course calendar, regional correspondents, accident reporting.
- FFESSM – Commission nationale plongée souterraine ↗
Cave-diving commission of the French diving federation: regional teams, training, expedition calendar, incident reporting (REX).
Plan a cave diving trip to the Vercors
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 public sources: the FFS site plongeesout (site sheets, reports, chamber list), Spelunca, Vercors Plongée, Visites Nature Vercors, Wikipedia, grottomap, DREAL Auvergne-Rhône-Alpes, CDS 38, Vercors Vertical, gouffre-berger.com, Vercors-Drôme tourism, plongeur.com, altituderando and decathlon-outdoor (September 2026). Much of the dive data comes from exploration reports (1997–2010) and sometimes differs between sources. Pins from Wikipedia, grottomap, the tourism database, the plus code of a meeting point and two converted Lambert III coordinates; one site without a pin. ~ = estimate. Rules change — check locally.