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Doubs and Jura · about 32 km from Morteau

Sources du Cusancin (Source Bleue)

  • CertificationFull cave
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Diving and fills

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Fills nearby

  • Fill stationDiveStation (Neuchâtel, Zwitserland)~73 min drive (estimate)Air, nitrox and trimix up to 300 bar; nitrox and trimix only during opening hours. O₂: ask.Route ↗
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The dive

At the head of the Val de Cusance two springs lie close together: the clear blue Source Bleue (l'Anse) and the darker, stronger Source Verte (la Cuse).

Profile and sections

At the head of the Val de Cusance two springs lie close together: the clear blue Source Bleue (l'Anse) and the darker, stronger Source Verte (la Cuse). Together they form the Cusancin. Which of the two holds the 220 m explored is not known.

Depth and profile
Flooded gallery explored for 220 m to an unpassed restriction; two sumps in the main gallery, side sumps all end at restrictions. Depth not published.
Configuration
No data on passage size; expect restrictions at the far ends.
DPV: Not DPV-suitable (estimate)
Short gallery (220 m) with restrictions: no scooter.
Who can dive where
  • CaveAt least Full cave
  • Whole caveConfigurations: Backmount / twinset / Sidemount / CCR / Small cylinders / no-mount (speleo sumps)
  • Whole caveConfiguration unknown — research beforehand · doesn't decide who may dive

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

From Baume-les-Dames take the D50 to Pont-les-Moulins, then the D21 into the Val de Cusance. Picnic areas, hotel and restaurant on site.

Plan your route ↗

Around Sources du Cusancin (Source Bleue)

Fills1 fill station · 52 km

  • DiveStation (Neuchâtel, Zwitserland)

    ~73 min drive (estimate)

    Route de la Pierre-à-Mazel 4, 2000 Neuchâtel, Switzerland

    Air, nitrox and trimix up to 300 bar; nitrox and trimix only during opening hours. O₂: ask.

    Tue–Fri 9:00–12:00 and 13:30–18:30, Sat 9:00–16:00; air station 24/7 (subscription: ask)

    Dive shop with a fill station; formerly the Neuchâtel branch of plongee.ch. The nearest known trimix address. CCR supplies (sorb) and walk-in fills for visitors: ask.

    Website ↗Navigate ↗
Where to sleepAround Morteau on Booking.com ↗

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Caves nearby4 within 58 km

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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 web research (plongeesout.ffspeleo.fr, GSD – Groupe Spéléo du Doubs, Spélé'Haut-Jura, Jura Spéléo/CDS 39, CDS 25, Grottomap, Académie de Besançon, Lieux insolites, Montagnes du Jura, La Haute-Saône, Destination Haut-Doubs, Wikipedia, Grottes de Vallorbe, CMAS.ch, plongee.ch, DuikeninBeeld, SSN Namur, Plongeur.com, Spéléo Club de Dijon, MedSubHyp, DiveStation; Sept 2026). Much of the dive data is old (1969–1993) or comes from single club reports. Pins from Wikipedia, Grottomap, tourist offices and converted Lambert/Swiss grid coordinates; the Source du Dard is pinned at the entrance of the Grottes de Baume and the Source du Planey at the spring itself (both OpenStreetMap); the Source du Pont du Diable and the Exsurgence de Brive from Grottocenter. ~ = estimate. Rules change — check locally.