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Grotte de Thaïs

Vercors · about 1 km from Saint-Nazaire-en-Royans

Grotte de Thaïs

Closed to divers

Closed to divers: private show-cave land. The owner (Visites Nature Vercors) does not want this site listed as a dive site on DiveTripPlanner; you cannot dive here.

Source: Visites Nature Vercors, e-mail aan DiveTripPlanner, okt 2026 ↗
  • Max depth97 m
  • CertificationFull cave
  • SpecialSidemount
Directions

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Status
Closed

What it looks like

All 6 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 spring of the underground river Thaïs, which flows into the Bourne. The water is clear and ~10 °C according to the exploration reports (1997, 2004), but stirred-up silt in S6 spoils the way out.

S6 drops via a fracture to -25 m and a gallery to -78 m, then through narrower sections with the 'Limande' (~50 m long, max 60 cm wide) to -91 m. Stirred-up silt kills the visibility on the way out. Exploration dive in 2004: 4 h 30, including 140 min of deco.
Source: Spelunca 96 (dec. 2004) – Grotte de Thaïs, exploration du 1er février 2004 (pdf) ↗Source: plongeesout.ffspeleo.fr – Grotte de Thaïs ↗
Beyond S5 only on trimix: the explorers dived S6 on trimix 20/30 with decompression on nitrox and oxygen.
Source: Spelunca 96 (dec. 2004) – Grotte de Thaïs, exploration du 1er février 2004 (pdf) ↗
Profile and sections

The spring of the underground river Thaïs, which flows into the Bourne. The water is clear and ~10 °C according to the exploration reports (1997, 2004), but stirred-up silt in S6 spoils the way out. The spring's water regime is described as unpredictable (plongeesout).

The cave is a show cave with traces of late-glacial occupation. S1 was passed in 1957; S6 was explored step by step to -97 m (1975–1998).

Depth and profile
S1 40 m / -6 · S2 40 m / -9 · S3 50 m / -7 · S4 5 m · S5 45 m / -11 · S6 600 m / -97 (1998; in 2004 terminus at -91 m, ~820 m from the start of the flooded section)
Configuration
Closed to divers.
Who can dive where
  • CaveAt least Full cave
  • Whole caveConfigurations: Backmount / twinset / Sidemount / CCR / Small cylinders / no-mount (speleo sumps)
  • Whole caveGoes down to 97 m (trimix or deco may be needed) · doesn't decide who may dive
Dry sections / haulingDepends on water level or swell

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

Show cave on the east side of the village, below the D1532, on private show-cave land (Visites Nature Vercors).

Plan your route ↗

Around Grotte de Thaïs

FillsNo fill station known nearby
Caves nearby5 within 37 km

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Sources, sharing and disclaimer

Sources

Current conditions

Visibility, flow and water levels change quickly. Right before your dive, check what other divers report:

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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.