Plongée en mine en Finlande
Ojamo à Lohja (mine de calcaire jusqu'à -160 m, à ~60 km d'Helsinki) et Montola près de Pieksämäki, toutes deux uniquement lors d'événements de l'association locale, ainsi que les carrières de Kaatiala et de Paakkila, avec de courts tunnels.
4 mines · jusqu'à 160 m · 4 à la portée d'une équipe Intro
Les descriptions des grottes sont pour l'instant en anglais.
Les 4 mines
| Site | Prof. max. | Type | Brevet |
|---|---|---|---|
| Kaatialan louhos | 39 m | Backmount | Intro to cave |
| Montolan kaivos | 140 m | Backmount | Intro to cave |
| Ojamon kalkkikivikaivos (Ojamo) | 160 m | Backmount | Intro to cave |
| Paakkilan asbestikaivos | 30 m | Backmount | Intro to cave |
Les brevets requis, les configurations et les profondeurs trimix sont des estimations destinées à la planification. Vérifiez-les toujours sur place et plongez dans les limites de votre formation.
Infos pratiques : règles, gonflage et numéros d'urgence
Urgences
- Accident: call 112 and start oxygen; for mild symptoms contact your health service or DAN Europe +39 06 4211 5685 (24/7; also online emergency call via emergencycall.daneurope.org). Finland's national hyperbaric oxygen therapy centre is at Tyks, Turku University Hospital; Tyks emergency department (T-hospital): Savitehtaankatu 1, door 18O, Turku, 24/7; medical advice line 116117. No direct chamber number found — go through 112. At Montola, oxygen and an AED are in the changing room.
Accès et règles
- Access: in Finnish mines you dive via the association that holds the rights. Ojamo (Lohja) and Montola (Pieksämäki) only at events of Ojamon Kaivossukeltajat ry and Montolan Kaivossukeltajat ry (membership/registration in their portal; independent diving not allowed). At Ojamo you share the pit with the training institutions Meriturva and Luksia; the city has leased the diving base to a non-commercial association since 1 July 2024. Kaatiala: no booking needed (everyman's right). Paakkila: private land, notify the owner (via Kuopion Urheilusukeltajat ry or the Paakkila Facebook group); free.
- Rules: Montola (2024 safety document) — open water CMAS P1, mine at least Intro to Cave or equivalent, thirds, CCR bailout ≥1.5×, max END 40 m, max one dive deeper than -40 m per day, no entering the mine without a guideline, under-18s not in the mine. Ojamo (ojamodive.fi) — dive plan to the organiser, dive leader and a safety diver on standby, support team for dives >60 m or >180 min; under ice a surface line and cave or mine certification (Yle 2026).
Gaz et gonflage
- Gas: no public trimix or O₂ station found near Lohja; Arctic Divers in Helsinki fills air (200/300 bar). Finnish clubs run their own compressors and mix stations for members (e.g. Jyväskylän Delfiinit, a founding club of the Montola association: nitrox, O₂, trimix, argon) — ask your event organiser. Finnish rules (Tukes): O₂-cleaned cylinders are marked 'OXYGEN-SERVICED' with who serviced them and when, mix cylinders are labelled NITROX/TRIMIX/OXYGEN, and the fill station records the last periodic inspection — bring cylinders with a valid test.
Eau et saison
- Water and season: the mines are ~4 °C at depth all year. The pits reach ~20 °C in summer, but visibility then drops to ≤1 m (algae) and in autumn sometimes to near zero (humus); winter gives the clearest water. In winter Ojamo and Montola keep a hole open with pumps; Montola has de-icing on the stairs and habitats at -6 m, Ojamo heated changing huts. Drysuit with dry gloves and heating; Finnish divers inflate their suits with argon.
Sécurité
- General mine caution: old installations remain (rails, carts, lamps, tools, cables) — entanglement and sharp metal; silt comes down from the ceilings; never breathe the air in an air pocket.
Sur la route et aux alentours
- Distances: Ojamo is ~60 km west of Helsinki; Montola is in Montola village, ~18 km south of Pieksämäki; Kaatiala (Kuortane, South Ostrobothnia) and Paakkila (Tuusniemi, ~70 km from Kuopio) are far from Lohja — plan them as separate trips.
Jour de repos
- Rest day: Tytyri Mine Experience (mine museum) in Lohja, with an underground gallery ~100 m down (it showed Ojamo mine-diving photos in 2024); the Ojamo iron mine (from 1542, the oldest known in Finland) is on private manor land — visit via Lohja's tourist service or on open days.
Planifiez un séjour de plongée souterraine en Finlande
Saisissez votre équipe, avec brevets, gaz et configurations, et voyez tout de suite quelles grottes vous conviennent. Avec les temps de route depuis votre hébergement, les stations de gonflage et un instructeur IA qui réfléchit avec vous.
Compiled from web research (Sukeltaja-lehti 2025–2026, Montolan Kaivossukeltajat (rules, 2024 safety document), ojamodive.fi, City of Lohja, Yle 2026, MTV 2017, X-Ray Mag 2013, Divers of the Dark, Divers24, SLL Lohja, Sukeltajaliitto, Kuortane municipality, Divers B&B, Tyks, Tukes, Arctic Divers, Jyväskylän Delfiinit, Lohjalla tapahtuu, Wikipedia; Sept 2026). Pins from Montolan Kaivossukeltajat and the Sukeltajaliitto MML map link; Ojamo (approximate) and Kaatiala from wannadive. ~ = estimate. Rules change — check locally.