blog.vill.ogasawara.tokyo.jp · Tourism
Published Apr 23, 2016Municipal cruise note showing Sohugan as a route waypoint in the Ogasawara area.
Remote open-ocean rock with pelagic drift diving.
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Sohugan is a remote open-ocean rock between the Ogasawara Islands and Hachijojima. The site is an expedition-style blue-water target with steep relief, passing pelagics, and far more open sea than shelter. It suits experienced divers who are comfortable with long boat logistics and changing offshore conditions. Expect a true offshore objective: the surrounding water, weather window, and drift plan matter as much as the rock itself, and the dive rewards teams that stay organized and conservative rather than treating it like an easy day-trip reef.
Conservative baseline from public research. No community dives logged yet.
Depth range, seasonality, and planning context.
Reported Depth
15m - 2500m
Depth Note
The rock is described as rising from a depth of about 2,500 m, indicating very deep surrounding water rather than a typical diving depth.
Best Season
Year-round in settled offshore weather windows.
Typical Conditions
Open-ocean, precipitous setting around an isolated rock outcrop.
Hazards, restrictions, and access requirements.
Key Hazards
Safety Notes
Remote offshore site requiring a long charter-boat transit; pelagic wildlife including sharks may be encountered.
Access Restrictions
Charter-boat only; no casual shore entry or self-guided access.
Legal Notes
No routine public shore access is documented; verify operator permissions and weather windows before departure.
Community notes to help plan your visit.
Scuba Diving
Best for experienced blue-water scuba teams comfortable with exposed offshore conditions, long boat days, and moving water.
Freediving
Not a practical freedive target; it is a remote boat objective in deep open water.
Snorkeling
Not a snorkel site.
Use the planner to scan this week, inspect today in local time, and understand how exposure shapes conditions at Sohugan.
Directional shelter context for incoming swell.
Species commonly reported at this site, with direct links into their wildlife guides.
Community dive logs and visit reports for this site.
No Dive Logs Yet
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Average conditions based on logged dives & visits.
Planning answers for access, conditions, timing, and site logistics.
Last Updated
Research Sources
Municipal cruise note showing Sohugan as a route waypoint in the Ogasawara area.
Dive-shop post describing the offshore dive profile, long crossing, pelagic life, visibility, and drift-style shelves.
Official marine-volcano entry with the rock's coordinates, elevation, and surrounding seafloor context.
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