Hranice Abyss
Czech Republic · Moravia
The world’s deepest known flooded cave — a technical diving destination of global significance in the Czech Republic.
How this reef is doing
ⓘ How we measure thisReef state
Live science signals for this reef are still being gathered.
Coral cover
Fish life
Heat
Fishing
Open to fishing, and the water is fairly quiet.
Sources · Global Fishing Watch and reef gravity
What you will see
8 species across the dive sites here
grass snake
Seen 1 month ago
at Hranice Abyss
Least concern
White-lipped Snail
Seen 2 months ago
at Hranice Abyss
Least concern
Common Rough Woodlouse
Seen 2 months ago
at Hranice Abyss
Sand Lizard
Seen 2 months ago
at Hranice Abyss
Least concern
Ash-black Slug
Seen 3 months ago
at Hranice Abyss
Least concern
Smooth Snake
Seen 3 months ago
at Hranice Abyss
Least concern
European Crayfish
Seen 11 months ago
at Hranice Abyss
Vulnerable
Roman Snail
Seen Aug 2025
at Hranice Abyss
Least concern
