Plongée à Ojamo Mine — Finland
Ojamo Mine is a flooded limestone quarry near Helsinki offering astonishing visibility that can exceed 40 metres in its frigid, gin-clear water. Submerged tunnels, mining equipment, and even a sunken forest create an eerie overhead environment. Drysuit and overhead training are mandatory.
- Score
- 53.8
- Visibilité
- 15–40m
- Température
- 4–6°C
- Meilleurs mois
- January, February, March
Ojamo Mine is a flooded limestone quarry near Helsinki offering astonishing visibility that can exceed 40 metres in its frigid, gin-clear water. Submerged tunnels, mining equipment, and even a sunken forest create an eerie overhead environment. Drysuit and overhead training are mandatory.
Finland's Crystal-Clear Underground Lake
Score Breakdown
Click any score to see a detailed breakdown
Marine Life
10.0Species diversity, megafauna encounters, reef fish abundance, macro life, and endemic species.
Key Species
Dive Types
Traveling with Non-Divers?
Your non-diving travel companions will find plenty to enjoy topside while you're underwater. Here are some activities to consider.
Activities for Non-Divers
Nearby Cultural Sites
- Tytyri Mine Museum
- Lohja Church
Non-Diver Score
Limited topside — plan ahead for non-diving partners.
Safety & Emergency
Chamber at Helsinki University Hospital (Meilahti); local ambulance ~10 min
Top Operators
Ojamo Dive Center
TDI
Helsinki Dive Club
CMAS