Slovenia · about 5 km from Postojna
Planinska jama
Info · exploration
No free access for divers: the sumps have been explored by Slovenian cave divers. Ask the Jamarska zveza Slovenije.
- CertificationFull cave
- SpecialExperienced divers
Diving and fills
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Now at Planinska jama
The dive
Planinska jama is Slovenia's largest water cave. At ~500 m in, the Pivka (via Postojna Cave) and the Rak meet, one of Europe's largest underground river confluences, and ~300 m further the Unica flows out.
Part of Postojna–Planina Cave System. Also in this system: Postojnska jama
1 earlier accident or incident has been reported at this cave. Read what happened ↓
Profile and sections
Planinska jama is Slovenia's largest water cave. At ~500 m in, the Pivka (via Postojna Cave) and the Rak meet, one of Europe's largest underground river confluences, and ~300 m further the Unica flows out.
Water tracing shows a connection with Postojna Cave; together >31 km. Slovenian cave divers have worked here since the late 1960s.
- Depth and profile
- Cave 6,656 m long; sump depths and lengths not published
- Configuration
- No data; the sumps are reached via river passages, with gear transported over the water.
- DPV: Not DPV-suitable
- Research cave; motorised craft are banned in caves, electric scooters only for sump research (ZVPJ art. 18).
Who can dive where
- At least Full cave
- Configurations: Backmount / twinset / Sidemount / CCR / Small cylinders / no-mount (speleo sumps)
- Configuration unknown — research beforehand
- Experienced divers only
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
Tourist water cave near the village of Planina (Postojna municipality) with paths and wooden footbridges. No free access for divers: the sumps lie in the river passages and have been explored by Slovenian cave divers. Ask the Jamarska zveza Slovenije.
Around Planinska jama
FillsNo fill station known nearby
Caves nearby6 within 56 km
News
All (1)
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 accident in 1990: during research a boat capsized; the researcher fell into a sump and drowned.
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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