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Austria · about 10 km from Gmunden

Rötelseehöhle

  • Max depth48 m
  • CertificationFull cave
  • Water temperature≈ ~6 °Cestimated, no reports yet
  • SpecialExperienced divers

Diving and fills

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Fills nearby

  • Fill stationUnder Pressure Divecenter (Weyregg am Attersee)~32 min drive (estimate)Air and nitrox (EAN28, 32 and 36) to 220 bar, trimix, oxygen up to 100 % and helium; argon on requestRoute ↗
  • Fill stationATS DiveCenter Seefeld (Steinbach am Attersee)~32 min drive (estimate)Air, nitrox and trimix (per Upper Austria's tourism website; not on its own website) — askRoute ↗
  • Fill stationNautilus Tauchcenter (Unterach am Attersee)~37 min drive (estimate)Air (also 24/7 at the outdoor fill station), nitrox, trimix and argon; O₂ and pressure (200/300 bar): askRoute ↗
All fill stations and places to stay ↓

The dive

In April 2010 visibility was 5–8 m (with the water 1.5 m above normal from snowmelt); on the way out in 2011 it was zero. A 2010 dive took ~58 min bottom time, 106 min in total.

Thick silt and smooth walls with few tie-off points: visibility dropped to zero on the way out in 2011.
The access path is steep and exposed — not for inexperienced hikers.
Profile and sections

In April 2010 visibility was 5–8 m (with the water 1.5 m above normal from snowmelt); on the way out in 2011 it was zero. A 2010 dive took ~58 min bottom time, 106 min in total.

Upper Austrian cave divers explored the cave in 2009–2011, followed by line clean-up and survey work in 2011. The cave is a Naturdenkmal.

Depth and profile
Cave lake ~150–160 m², ~4 m deep (>7 m in flood), 6–9 m below the entrance · underwater: air chambers (Deixlersee, Zwergendom at ~50 m), then a steep passage to -48 m (2010) · 2011: ~20 m of new low passage beyond the Zwergendom, to -27 m · cave surveyed to 391 m
Configuration
In 2010 dived with two rebreathers (eCCR and mCCR), each with 2× 80 cft bailout and an O₂ cylinder staged at -6 m. Beyond the Zwergendom a low, heavily silted passage. Water ~6 °C.
DPV: Not DPV-suitable (estimate)
Steep carry and a short, low, silty passage: no scooter (estimate).
Who can dive where
  • CaveAt least Full cave
  • Whole caveConfigurations: Backmount / twinset / Sidemount / CCR / Small cylinders / no-mount (speleo sumps)
  • Whole caveConfiguration unknown — research beforehand · doesn't decide who may dive
  • Whole caveGoes down to 48 m (trimix or deco may be needed) · doesn't decide who may dive
  • Whole caveExperienced divers only · doesn't decide who may dive
Dry sections / haulingExperienced diversDepends on water level or swellPermission 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

By boat across the Traunsee (e.g. ~15 min from the Winkel slipway) or by kayak to Karbach on the east shore, then a steep path to the entrance at 600 m (~20–50 min, ~170 m of ascent). Inside you descend a ~25 m debris slope to the cave lake. In 2010 six porters carried ~200 kg of gear; in 2011 the team built a 370 m material ropeway. Land of the Österreichische Bundesforste: permission required.

Plan your route ↗

Around Rötelseehöhle

Fills3 fill stations · nearest 20 km
  • Under Pressure Divecenter (Weyregg am Attersee)

    ~32 min drive (estimate)

    Landeroith 1, 4852 Weyregg am Attersee

    Air and nitrox (EAN28, 32 and 36) to 220 bar, trimix, oxygen up to 100 % and helium; argon on request

    Apr–Oct Tue–Sun 9:00–18:00; Nov–Mar Thu–Sun 9:00–17:00; open on public holidays. Closed for the company holiday 7–31 January. Groups also by appointment.

    Dive base on the east shore of the Attersee, open all year, with shop, fill station for technical gases and service workshop. Technical courses (TDI) from Intro to Tech to Advanced Trimix, and sidemount up to Tec Sidemount. Rooms at the base.

  • ATS DiveCenter Seefeld (Steinbach am Attersee)

    ~32 min drive (estimate)

    Seefeld 14, 4853 Steinbach am Attersee

    Air, nitrox and trimix (per Upper Austria's tourism website; not on its own website) — ask

    By appointment only

    Centre for technical and rebreather diving (IANTD Diamond Facility) at Gasthaus Föttinger, on the east shore of the Attersee: rebreather courses (JJ-CCR, iQsub XCCR and FX) from recreational to trimix, crossovers and test days, and servicing of rebreathers, regulators, heating and scooters. Second address: ATS DiveBase, Haslach 4, Steinbach am Attersee.

  • Nautilus Tauchcenter (Unterach am Attersee)

    ~37 min drive (estimate)

    Atterseestraße 86, 4866 Unterach am Attersee

    Air (also 24/7 at the outdoor fill station), nitrox, trimix and argon; O₂ and pressure (200/300 bar): ask

    May–Sep daily 9:00–18:00; Oct daily 9:00–18:00 (16–31 Oct weekends only); Apr and Nov Fri 14:00–18:00, Sat–Sun 9:00–18:00; Dec–Mar by appointment. Outdoor station (air) 24/7.

    Dive centre right on the Attersee with shop, repairs, rentals, technical training and rebreather support. Trimix for visitors: ask in advance.

Where to sleepAround Gmunden on Booking.com ↗

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Caves nearby4 within 56 km

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Sources, sharing and disclaimer

Sources

Current conditions

Visibility, flow and water levels change quickly. Right before your dive, check what other divers report:

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Certification requirements, configurations and trimix depths are estimates for planning. Always check them locally and dive within your training. Compiled from web research (Wikipedia de/en, the 'Höhlentauchen in Oberösterreich' blog, VHO (hoehle.at), norbertleutner.at, cavediving.cz, FST (fst-int.com), lochstein.de, meinbezirk.at, Stodertalfreunde, showcaves.com, schauhoehlen.at, Dachstein Salzkammergut, wasserlochklamm.at, EnnstalWiki, europeanwaterfalls.com, gollinger-wasserfall.com, Gipfeltreffen, ORF Steiermark, Salzburg cave law (jusline), Land Oberösterreich, Notruf NÖ, GTÜM, Austrian cave rescue association, hallstatt.net, salzkammergut.at, nautilus.at; Sept 2026). Pins from Wikipedia, showcaves.com and a car park (europeanwaterfalls.com); the Hirschbrunn and Rötelseehöhle pins are from OpenStreetMap; the Kessel has no pin. ~ = estimate. Rules change — check locally.