karttapalvelu.lohja.fi · Official
Lohja local geology document naming Ojamon kaivos.
Dive Spot Guide•
Ojamo Mine
Historic flooded mine with cold, clear water and overhead passages.
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Local operator required
Access is managed through approved site operators and pre-arranged dive days.
Cold freshwater mine near Lohja with organized access, overhead tunnels, and variable open-quarry water.
About Ojamo Mine
Ojamo Mine is a historic flooded limestone mine near Lohja, west of Helsinki. It combines cold, clear freshwater passages with an overhead tunnel system and more variable open quarry water. Access is organized rather than walk-in, and the site rewards divers who plan for cold-water kit, lights, line handling, and conservative gas management.
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Research Estimate At Ojamo Mine
Conservative baseline from public research. No community dives logged yet.
VisibilityVisibility: 20m
AccessModerate entry effort
Aquatic LifeSome life
FacilitiesBasic facilities
Crowd / PopularityQuite busy
CurrentNo current
Where Is Ojamo Mine?
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Community sourced coordinates.
Ojamo Mine Planning Details
Depth range, seasonality, and planning context.
Reported Depth
Up to 58m
Depth Note
Deepest documented point is 58 m; some directories list 55 m.
Typical Conditions
Cold, clear freshwater in the tunnels; open quarry water varies more with season and surface conditions.
Safety & Access At Ojamo Mine
Hazards, restrictions, and access requirements.
Key Hazards
Cold waterOverhead environmentRestricted access
Safety Notes
Treat Ojamo as an overhead, cold-water site. Tunnel sections require line discipline and conservative gas planning; the open quarry is a different environment.
Access Restrictions
Access is restricted to organized dives and authorized users.
Legal Notes
Do not enter outside approved dive activities; the site is access-controlled.
Local Intel For Ojamo Mine
Community notes to help plan your visit.
Scuba Diving
Best suited to trained scuba divers comfortable with cold-water gear, line handling, and overhead-environment procedures.
Recent Logged Visits At Ojamo Mine
Community dive logs and visit reports for this site.
Dive Spot Log Averages At Ojamo Mine
Average conditions based on logged dives & visits.
Conditions
Avg. Visibility20m
Activity
No dive activity logged yet.
