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Barrois · about 4 km from Ancerville

Grande Fontaine de Sommelonne (Trou Bleu)

  • Max depth7 m
  • CertificationFull cave
  • SpecialExperienced divers
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The dive

A funnel-shaped entrance leads to a horizontal passage with low ceilings. Visibility is often poor (historically 1 m at most). The water temperature is not published.

A boulder choke became unstable after a 2006 earthquake, and the narrow entrance has to be passed with your kit off.
Source: plongeesout (FFS) – La Grande Fontaine (Sommelonne) ↗
Profile and sections

A funnel-shaped entrance leads to a horizontal passage with low ceilings. Visibility is often poor (historically 1 m at most). The water temperature is not published.

The spring is also called the résurgence de l'Ornel. It was first dived in 1962. After a minor earthquake in 2006 a boulder choke became unstable and exploration stopped (2007 sheet).

Depth and profile
-5 to -7 m. Explored to ~800 m in the 2000s; ~850 m according to the GERSM, exploration ongoing.
Configuration
Narrow entrance where you have to take your kit off to get through; low passages beyond. Small cylinders or sidemount only; not for backmount or CCR.
DPV: Not DPV-suitable (estimate)
Narrow entrance and low passages: no scooter (estimate).
Who can dive where
  • CaveAt least Full cave
  • Whole caveConfigurations: Sidemount / Small cylinders / no-mount (speleo sumps)
  • Whole caveGoes down to 7 m (trimix or deco may be needed) · doesn't decide who may dive
  • Whole caveExperienced divers only · doesn't decide who may dive
Experienced divers

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

In the village: follow the direction of 'la Houpette' and turn right onto a track before the end of the village. Pool about 10 m across. Access rules not published; ask CDS 55 or the GERSM.

Plan your route ↗

Around Grande Fontaine de Sommelonne (Trou Bleu)

FillsNo fill station known nearby
Where to sleepAround Ancerville on Booking.com ↗

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Caves nearby6 within 14 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: plongeesout.ffspeleo.fr (FFS site sheets, mostly 1994–2007; Dhuit 2019), the GERSM and CDS 55, Wikipedia, grottomap (IKARE data), showcaves.com, Spéléo Club de Paris, ABIMES, the Maison lorraine de la spéléologie, the FFS, the Meuse département, JHM, Haute-Marne Attractivité, fontesdart.org, MedSubHyp and CDS 07 (September 2026). Much of the dive data is old or comes from a single exploration team. Pins from Wikipedia and grottomap or converted from plongeesout's Lambert coordinates; the Dhuit has no pin yet. ~ = estimate. Rules change — check locally.