Visibility, currents, and qualification notes.
Dive Spot Guide•
M2 (Wreck)
Protected upright submarine wreck off Portland.
Deep boat wreck with intact submarine structure, tide-sensitive timing, and an overhead hangar feature.
About M2 (Wreck)
M2 (Wreck) is a famous upright submarine wreck off Portland that sits on the seabed as a protected war grave. The intact hull, conning tower, and hangar make it a distinctive deep wreck dive, but tides, current windows, and excellent buoyancy control matter more than sightseeing speed. Plan it as a boat dive with a strict tide window, expect limited bottom time, and treat the hangar and deck structure as something to observe cleanly rather than push into.
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Research Estimate At M2 (Wreck)
Conservative baseline from public research. No community dives logged yet.
VisibilityVisibility: 8m
AccessChallenging entry effort
CoralHeavily damaged
Aquatic LifeGreat variety
FacilitiesBasic facilities
Crowd / PopularityModerate
CurrentStrong current
SurgeLight surge
Where Is M2 (Wreck)?
This spotNearby spotsExplore nearby spots on the map
Community sourced coordinates.
M2 (Wreck) Planning Details
Depth range, seasonality, and planning context.
Reported Depth
18m - 32m
Depth Note
The wreck sits upright with the conning tower around 18 to 20 m and the keel near 32 m.
Best Season
Year-round, but slack tide windows and settled weather matter most.
Typical Conditions
Deep, tide-driven wreck diving with variable visibility and limited access windows.
Safety & Access At M2 (Wreck)
Hazards, restrictions, and access requirements.
Key Hazards
Overhead environmentRestricted accessStrong current
Safety Notes
Use DSMB proficiency, plan around slack water, and avoid any penetration.
Access Restrictions
Boat access only, with timing centered on slack water and local current windows.
Legal Notes
The wreck is a protected war grave and should be treated on a look-but-don't-touch basis.
Local Intel For M2 (Wreck)
Community notes to help plan your visit.
Scuba Diving
Intact submarine wreck with a conning tower, hangar, and deck features that are best observed from outside.
Freediving
Not a freedive site due depth and protected status.
Snorkeling
Not a snorkel site.
Wildlife at M2 (Wreck)
Species commonly reported at this site, with direct links into their wildlife guides.
Recent Logged Visits At M2 (Wreck)
Community dive logs and visit reports for this site.
Dive Spot Log Averages At M2 (Wreck)
Average conditions based on logged dives & visits.
Conditions
Avg. Visibility8m
Activity
No dive activity logged yet.
