Czechia · about 3 km from Hranice
Hranická propast
Closed to divers
No recreational diving: the abyss lies in the Hůrka u Hranic national nature reserve and only members of ZO ČSS 7-02 Hranický kras (and cave divers they bring along) dive it, for research.
- Max depth450 m
- CertificationFull cave
- SpecialRopework
Diving and fills
Dive here with
No dive centre guides here yet. Do you dive here with guests? Add your centre for free →
Now at Hranická propast
What it looks like
Record-Breaking Cave Dive in Hranická Propast with a Rebreather Hranická propast s CCR Inspiration - video z roku 2004 The Hidden Depths of Hranice Abyss Deepest Underwater Cave
All 5 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.
Record-Breaking Cave Dive in Hranická Propast with a Rebreather Hranická propast s CCR Inspiration - video z roku 2004 The Hidden Depths of Hranice Abyss Deepest Underwater Cave
- Facebook
Krzysztof Starnawski Expedition
- Facebook
Krzysztof Starnawski Expedition
Search for more onYouTube ↗Instagram ↗Facebook ↗
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 CO₂-rich mineral water of 15–22 °C (one source: 19 °C in September); visibility at depth averages ~12 m according to one source.
1 earlier accident or incident has been reported at this cave. Read what happened ↓
Profile and sections
The water is CO₂-rich mineral water of 15–22 °C (one source: 19 °C in September); visibility at depth averages ~12 m according to one source. According to its managers this is the deepest known flooded freshwater abyss in the world. It lies in Devonian limestone of the Hranice karst, inside the Hůrka u Hranic national nature reserve (since 1952).
ZO ČSS 7-02 Hranický kras has explored it since 1978. In 2019 the fire service, police and cavers practised searching for and recovering divers here.
- Depth and profile
- Dry shaft 69.5 m deep (104 × 34 m) · underwater measured by ROV to 404 m (2016) and 450 m (2022); total ~519.5–521 m, bottom not reached · deepest dive -265 m (2015)
- Configuration
- Not applicable: research dives by the ČSS group only.
- DPV: Not DPV-suitable (estimate)
- Not applicable: not open to visiting divers.
Who can dive where
- At least Full cave
- Configurations: Backmount / twinset / Sidemount / CCR / Small cylinders / no-mount (speleo sumps)
- Goes down to 450 m (trimix or deco may be needed)
- Ropework (SRT) needed
- 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
Not diveable for visitors. You can look: the rim of the abyss with a viewing platform is reached on foot via a nature trail from Teplice nad Bečvou station or the red-marked trail from the Hranice campsite.
Around Hranická propast
FillsNo fill station known nearby
News
- Czech cave explorers and a robot have measured the Hranice Abyss to 1,476 feet underwater, and a decade after it became the world's deepest flooded cave, nobody knows where the bottom is ↗
- Hranická propast celebrates ten years since the world record. Its true depth is still unknown ↗
All (4)
- Hranická Abyss: Top diver Jan Enčev drowned during exploration ↗
- Hranická Abyss: Top diver drowned during exploration ↗
- Hranická Abyss may be as deep as 3.5 kilometres, says Michal Guba ↗
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 on 5 August 2026: during a research dive an experienced cave diver became separated from the team and contact was lost. Police divers and an underwater robot recovered the body the same night from ~-186 m; according to the rescuers both cylinders still held enough gas. Police opened an investigation.
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.
More of the latest in Czechia: conditions, closures and news →Going to Czechia with your team?
Marcel finds the sites that match your team's certifications.
Plan a trip