Bergslagen · about 21 km from Borlänge
Äventyrsgruvan – Tuna Hästberg
- Max depth114 m
- CertificationCavern
- Water temperature≈ 0–5 °Cestimated, no reports yet
- SpecialFlooded mine or quarry
Diving and fills
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Fills nearby
- Fill stationÄventyrsgruvan (Tuna Hästberg)Air and nitrox (EAN21–30; standard EAN30), trimix, O₂, argon; rebreather cylinders up to 3 l. Max 10 % above working pressure.Route ↗
- Fill stationLångban – duikbasis Långbans DyksällskapCompressor plus O₂ and helium bank; which mixes and up to what pressure: askRoute ↗
What it looks like
Gruvdykning Tuna Hästberg DIVING AN ABANDONED MINE - Tuna Hästberg, Sweden - Adventuremine. Tuna Hästberg mine diving - Ladder Route Tuna-Hästberg mine, January 2014
All 4 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.
Gruvdykning Tuna Hästberg DIVING AN ABANDONED MINE - Tuna Hästberg, Sweden - Adventuremine. Tuna Hästberg mine diving - Ladder Route Tuna-Hästberg mine, January 2014
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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 water is crystal-clear: >30 m visibility, 4–5 °C, with no plants or animals.
1 earlier accident or incident has been reported at this cave. Read what happened ↓
Profile and sections
The water is crystal-clear: >30 m visibility, 4–5 °C, with no plants or animals. You see mine carts (one still on its rails), ladders and stairs, tools, switches with light bulbs, dynamite boxes, wooden structures and a 19th-century pump station.
This is an iron-ore mine on the hill above Tuna Hästberg village, worked from the 15th century until 1968; everything below the 80 m level then flooded. It has been explored since 1998 (Baggbodykarna) and is now run by Äventyrsgruvan, which also offers dry adventure tours.
Practical: there is a heated room by the water and gas on site (see fill station). Arrange your own accommodation (per the FAQ). OW divers (AOW + drysuit + nitrox + night, ≥25 dives) dive the lit open halls with air above; dive centres run weekend trips there.
- Depth and profile
- Water surface ~80–85 m below ground. Line levels at ~-15, -35 and -70 m; large hall at -36 m. Most dives to -36 m on EAN30. Deeper than -40 m only with trimix and approval; from -55/-60 m advance approval per dive; below -78 m by invitation only. Deepest dived: -114 m (expeditions 2010–2011). >7 km of permanent line. OW programme: max -21 m, max 1 hour.
- Intro level
- With intro-to-cave: only along the permanent lines (most dives to -36 m on EAN30); full cave is required off the permanent lines.
- Configuration
- All configurations in roomy drifts and halls. CCR: CCR intro-to-cave/mine, or full cave OC + basic CCR + 50 h CCR experience, plus at least 20 h on your own unit; enough bailout to exit on your own (2 bailouts recommended). Max END 30 m (25 m recommended). Drysuit with thick or heated undergarments and dry gloves; two lights.
- DPV: DPV possible (estimate)
- Allowed with a DPV cave/mine/overhead certification on the system you use. With >7 km of line useful for the far sections; max 120 min per dive without approval.
Who can dive where
- At least Cavern
- Cavern zone / easier part: at least Intro to cave
- Configurations: Backmount / twinset / Sidemount / CCR / Small cylinders / no-mount (speleo sumps)
- Goes down to 114 m (trimix or deco may be needed)
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
Only via the operator (Äventyrsgruvan): create an account on diving.adventuremine.se, get your certificates approved (up to 48 h) and book and pay a dive event in advance (600 SEK ≈ €60 pp per day; cancel at least 7 days ahead per the FAQ, 10 days per the rules). Diving 9:00–18:00 on event days. On foot down an almost 110 m long wooden stairway (~430 steps) to the 80 m level; gear goes down by the mine hoist (not for people) and trolleys to the platform. Helmet mandatory (basic helmets free). Address: Krongruvvägen 50, Borlänge.
Around Äventyrsgruvan – Tuna Hästberg
Fills2 fill stations · nearest 0 km
Äventyrsgruvan (Tuna Hästberg)
Krongruvvägen 50, Borlänge
Air and nitrox (EAN21–30; standard EAN30), trimix, O₂, argon; rebreather cylinders up to 3 l. Max 10 % above working pressure.
On event days 9:00–18:00, for booked divers
By the water inside the mine (80 m level). Prices: air/nitrox 100 SEK per cylinder, 200 SEK per twinset, rebreather cylinder 50 SEK, suit inflation 75 SEK per event, O₂ 0.20 SEK/l, trimix 0.95 SEK/l; pay on site (card, cash SEK/EUR). Analyse your own gas (analyser free to borrow). Sorb (sofnolime) and CCR support: ask.
Långban – duikbasis Långbans Dyksällskap
Långban, Filipstad
Compressor plus O₂ and helium bank; which mixes and up to what pressure: ask
On club dive days (calendar on gruvdyk.se)
For club members; fills for non-members: ask. Drying room for suits and gear.
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News
- Person taken to hospital after diving accident in Tuna Hästberg ↗
- Regulations stopped the divers in the mine in Tuna Hästberg – were not allowed to recover the body ↗
All (2)
Accidents and incidents
What happened at this cave before, with the sources. No names are given; read it as a lesson for your own planning.
- Fatal accidents: Jan 2018 (problem at ~-20 m, ~400 m into the mine; the two team mates exited safely), Aug 2025 (surfaced unresponsive from ~-34 m during a scooter course; cause unknown; diving paused for a few weeks) and Dec 2025 (diver missing and found dead; investigation: no equipment defects, acute illness; afterwards all diving in the mine passages was paused). In Jan 2026 another diving accident followed, the third alarm in six months; the diver was taken to hospital. In Oct 2026 the operator's calendar listed diving days again. Earlier decompression sickness after deep dives (Feb 2011, -114 m, two divers; Mar 2012, -72 m), treated in the Karolinska chamber (Stockholm).
Access and rules change: check what applies locally right before your trip. Source: GDELT Project and the news feeds of diving magazines. Search for more news ↗ Searched automatically, last on 13 Nov 2026.
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