Czechia · about 9 km from Javorník
Důl Hraničná
- Max depth120 m
- CertificationFull cave
- Water temperature≈ ~8 °Cestimated, no reports yet
- SpecialFlooded mine or quarry
Diving and fills
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What it looks like
Důl Hraničná mine diving Dul Hranicna mine diving 2022 Hranicna Mine - Diving Diving in Důl Hraničná (iron mine in Czechia), level -45m
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Videos and posts
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Důl Hraničná mine diving Dul Hranicna mine diving 2022 Hranicna Mine - Diving Diving in Důl Hraničná (iron mine in Czechia), level -45m
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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
You dive in an old iron-ore mine: the walls are magnetite with white marble, hence their stripes. The water is 8 °C year-round, the mine air max 11 °C, and the pH 7.4.
Profile and sections
You dive in an old iron-ore mine: the walls are magnetite with white marble, hence their stripes. The water is 8 °C year-round, the mine air max 11 °C, and the pH 7.4. Visibility is 10 m or more according to the operator, and up to 30 m according to DIVE Magazine (2022).
The mine lies on the site of the vanished village of Hraničná. It was mined from the late 18th or mid-19th century (sources give 1790 and 1856) until 1967–68. Mining records give ~3.5 km of workings, the press ~21 km, about half of it flooded. The association took the mine over from the state company DIAMO in 2014, made it safe and opened it for tours in 2019. Emergency services and cave divers of the Czech caving federation ČSS use it a lot for training (large exercise in March 2023).
Practical: divers book through the same association. There is no fill station on site. A cottage nearby sleeps up to 11 (~CZK 350 pp).
- Depth and profile
- Shallow gallery ~-12 m (deco; stage points at -9 and -12 m) · top level ~-20 m · levels at ~-45/-50, ~-70/-75, ~-96/-100 and ~-120/-125 m (sources differ) · explored to >-110 m (2021); the shaft may reach ~-170 m
- Configuration
- Manifolded twinset (min. 4,000 l of gas) or CCR; according to a 2020 report CCR (also in sidemount configuration) and trimix are dived here. Required by the operator: wing ≥20 l, two separate regulators with a 210 cm hose, computer plus backup depth gauge, primary light (min. 25 W halogen, 1.5× your dive time), two backup lights, two reels ≥20 m, two cutting tools and wetnotes. Stages min. 40 cuft, analysed and labelled. Gas limits: ppO₂ 0.16–1.6 (deco gas max 1.4) and ppN₂ max 4 bar. CCR: at least 50 dives on your own unit plus enough bailout for the exit and deco. Small single cylinders do not meet the gas rule.
- DPV: DPV possible (estimate)
- Allowed with a DPV certification; CCR divers also need at least 50 dives on their unit and enough bailout for the exit with deco. How much you gain depends on the level and your plan.
Who can dive where
- At least Full cave
- Configurations: Backmount / twinset / Sidemount / CCR
- Goes down to 120 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 through the operator, the association Rychlebská báňsko-historická z.s. (Mine Diving CZ). Book by e-mail or phone: diving +420 777 666 941 or rbhos@seznam.cz, or via minedivingcz@gmail.com; free dates are shown in the online calendar on minehraniczna.cz. Bring: dive medical, insurance that covers cave diving (e.g. DAN) and a certification matching your dive and your gas (trimix card if you use trimix); you sign a dive plan and a rescue plan on site. Price per the Nov 2018 conditions: €40 or CZK 1,000 per diver per day, minimum €240 or CZK 6,000 per dive event — ask for current prices. No parking at the mine (forest road with a no-entry sign); ask where to unload. The water is ~300 m into the mine over a level floor; your gear goes in on carts. Helmet and own light are mandatory underground, and entries and exits are logged.
Around Důl Hraničná
FillsNo fill station known nearby
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