Tuna-Hästberg Adventure Mine dive site
Guided flooded section (max 21 m) / technical overhead site: operator zone [1] (The operator separates guided dives in an open flooded area from technical overhead diving for cave- or mine-trained divers.). These categories are the named scheme's own; they describe the training a site calls for.
The diving base of the Tuna-Hästberg visitor mine, about 80 m underground, serving both guided dives in an open flooded area (to about 21 m) and technical overhead dives on more than 7 km of permanent line.
Divers walk about 80 m down through the old mine to water level, while equipment is sent down by lift or carried on the former mine railway and then about 300 m to the dive site. The technical site has a warm room, changing area, dive platform and compressor with gas bank.
Guided dives in the flooded open section are capped at about 21 m and about an hour, and groups of 1 to 16 divers can be booked. Technical overhead divers use the permanent guideline network deeper in the mine.
The environment
Cold (about 4-5 °C), very clear mine water in tunnels and flooded chambers of a former iron mine.
Conditions
Stable conditions year-round; operator states visibility at the technical site is always over 30 m.
Typical ranges from published sources, not current conditions.
Facilities
Lift or mine railway for equipment, heated room, changing area, dive platform, compressor and gas bank (air, nitrox, trimix, argon at the technical site); no rental except cylinders in some cases.
Every fact on this page, with its source (8)
| Fact | Status | Source |
|---|---|---|
| Guided dives in the flooded section have a maximum depth of 21 m and last no more than about an hour. | Reported | [1] |
| Water in the flooded section is about 4-5 °C. | Reported | [1] |
| Diving costs from 500 SEK per dive day.Undated operator page viewed 2026-10-14. | Reported | [1] |
| Mine diving requires at least Advanced Open Water or equivalent; technical diving requires Full Cave, Intro to Cave or Mine Diver training.Dive-count requirements differ between sections of the page. | Reported | [1] |
| The technical site has a warm room, changing area, dive platform and compressor with gas bank, with air, nitrox, trimix and argon available. | Reported | [1] |
| Diving is offered year-round; groups of 1-16 divers. | Reported | [1] |
| Visibility at the technical site is always over 30 m. | Reported | [1] |
| Diving is offered year-round; no fixed diving hours are published. | Reported | [1] |
Verified: stated by an official or primary source we opened. Reported: from a secondary source only. Sources conflict: the note gives both versions. May be out of date: the newest source we found is old.
Written in our own words from the sources above. Report a correction