France – Lot cave springs

The limestone causses of the Lot (Quercy) drain through dozens of flooded caves that surface as springs along the Célé, the Lot and the Ouysse near Rocamadour. Sites such as the Ressel, Cabouy, Saint-Georges and Font del Truffe draw cave divers from all over Europe, with water around 13 °C and visibility that can exceed 20 m when rivers are low. Every site here is overhead diving: you need cave training, your own gas planning and respect for fragile access – many springs are on private land or are captured drinking-water sources, and several have been closed after accidents or disputes. Two southern legends, Fontaine de Vaucluse and Font Estramar, are listed for reference but are currently closed to divers.

Facts

Who may cave dive: There is no national cave-diving permit, but every cave here is beyond the daylight zone, so a cave qualification is expected. In the FFESSM system, Plongeur Souterrain 1 (PS1) requires an FFESSM licence and FFESSM Level 2 (or equivalent), and allows diving in lined caves (zone 2: max 40 m on air, max 30 min of stops, 1 h 30 total) only accompanied by at least a PS3; PS3 is the autonomous level (zone 3). Local centres teach TDI, IANTD, GUE and PSAI courses from cavern to Full Cave/CCR, and foreign Full Cave cards are what divers normally show (Source: souterraine.ffessm.fr PS1 sheet 2020; thecavetobe.com; lotfillingstation.com). Check current rules.
Medical certificate & insurance: For FFESSM cave training a medical certificate of no contraindication to diving less than one year old is required, plus complementary insurance covering personal accident and repatriation for the activity. Carry proof of diving insurance that explicitly covers cave diving and rescue (Source: souterraine.ffessm.fr PS1 sheet). Check current rules.
Access, landowners & etiquette: Most springs are on private land or are captured drinking-water sources, and access rests on fragile goodwill. Examples: Fontaine des Chartreux needs permission from Cahors town hall; the owners closed the Pescalerie (2004); Meyraguet is banned after a double fatality (2003); at Saint-Sauveur a temporary ban beyond the pool is posted, and earlier rules asked divers to report each dive to 112, leave one car per group, keep the gate shut and never run compressors; at Landenouse the owner asks divers not to block his ramps. Park only where indicated, keep sites clean, change discreetly and keep groups small (Source: plongeesout.ffspeleo.fr Lot site pages; lotfillingstation.com cave map). Check current rules.
Season & water levels: Spring (Apr–Jun) and autumn (Sep–Nov) are the main season, with good to excellent visibility (often 15–20 m+) when levels are stable. July–August is low water: often 15–30 m visibility in the big systems (Ressel, Cabouy, Landenouse, Saint-Georges), but small systems become very dry with long carries between sumps. December–March brings rain and floods: strong outflow can make the big caves impossible or dangerous and some access tracks flood. Check the Vigicrues gauges (Lot at Cahors, Célé at Figeac, Dordogne at Souillac) before every dive; with orange or red flood alerts, diving is strongly discouraged (Source: lotfillingstation.com Conditions). Check current conditions.
Water temperature & visibility after rain: Resurgence water stays at about 12–14 °C all year (around 13 °C); a drysuit is recommended for warmth and buoyancy redundancy. Rain directly affects visibility and current: rising river flow means water is draining from the karst, and in flood the caves of that sector are probably not diveable. Pools such as Cabouy can be zero-visibility at the surface while the cave beyond is clear (Source: lotfillingstation.com Conditions; Divernet 'Cave Diving in the Lot'). Check current conditions.
Bad air beyond sumps: Air bells and dry passages can hold high CO2 and low O2: at Meyraguet two divers died in 2003 in a bell measured at about 8% O2; the bivouac chamber beyond Ressel sump 2 and the dry sections of Marchepied are known for bad air; in 1970 two speleologists died of gas behind a sump at the Cadrieu spring (Source: plongeesout.ffspeleo.fr Meyraguet, Ressel, Marchepied, Landenouse pages).
Rescue (Spéléo Secours Français): For any underground accident (caving or cave diving) call 112 or 18, say it is an 'accident de spéléologie' and ask for the departmental cave-rescue technical adviser (CTDS) to be alerted; numbers are also in the SSFAlert app. The national Spéléo Secours Français operational line is 0800 121 123 (+33 800 121 123). The alert should come from a direct witness with time, place, circumstances and a basic casualty assessment (Source: lotfillingstation.com cave map, rescue section). Check current numbers.
Local caving committee (CDS 46): The Comité départemental de spéléologie du Lot (FFS) coordinates local caving, the SSF 46 rescue team and publishes the Spéléoguide du Lot; contact: 9 route de la Bastide, 46240 Montfaucon, +33 6 81 65 76 95, ffspeleo46@orange.fr (Source: cds46.fr/contact).
Gas fills & cave-diver lodging: Lot Filling Station (Cambes, near Figeac) fills air, nitrox, trimix and oxygen 7 days a week (24 h notice for trimix or large volumes). The Cave to Be (Gramat) has a fill station and rents apartments 100 m away (minimum 3 nights June–October). The gîte La Brenguoise (Brengues, Célé valley) has a fill station, drying room and gear storage – fills for its guests only (Source: lotfillingstation.com; thecavetobe.com; labrenguoise.fr). Check current prices and opening.
Getting there: Toulouse airport is about two hours' drive from Gramat; from a base around Gramat or Figeac most sites are 20–60 minutes away on winding roads, so a car is essential. Some sites are reached by narrow farm tracks with very limited parking (Source: Divernet 'Cave Diving in the Lot' 2025; Divernet 'Truffe or dare' 2022).
Southern legends: Vaucluse & Estramar: Fontaine de Vaucluse: the final path to the gouffre and the foot of the cliff are closed indefinitely because of rockfall risk (Département de Vaucluse and the commune, 2024), and the town banned diving in 1974. Font Estramar (Salses-le-Château): the owners withdrew diving permission and the 1955 municipal ban was never repealed; nine divers have died there (Source: echodumardi.com 2024; plongeesout.ffspeleo.fr; fr.wikipedia.org). Check current rules.

Season

Best months: May, Jun, Jul, Aug, Sep, Oct
Acceptable: Jan, Feb, Mar, Apr, Nov, Dec
Water temperature: 14–14 °C

The Lot caves are divable year-round, with water at about 14 C and visibility of 5–30 m. After heavy rain the big systems (e.g. Ressel) flood with strong current and become unenterable; late autumn and spring see more rain, so dry spells are most reliable. No Saint-Georges-specific data was found.

Dive sites (23)

Operators (3)

Lot Filling Station – dive centre, Cambes (near Figeac)
The Cave To Be – dive centre, Gramat
La Brenguoise (gîte) – resort, Brengues (Célé valley)

Routes (2)

Cave diving is overhead diving: without cave training, a continuous guideline and strict gas planning it can be fatal, and air bells or dry passages beyond sumps may hold unbreathable air. Access to many springs depends on landowners and town halls and can change at any time; closed sites are listed for information only. Depths and lengths come from published surveys and may not reflect current line or conditions – check water levels, current rules and local advice before every dive. Positions are for orientation only.

France – Lot cave springs

Facts

Season

Dive sites (23)

Dordogne & Ouysse (Rocamadour)

Other southern springs

Lot valley

Célé valley

Operators (3)

Routes (2)