Atami Kosoga Cave
About Atami Kosoga Cave
Kosoga Cave is a scenic dive in Atami, Shizuoka, featuring a semi-enclosed cave about 40 m long in the 6–12 m range. The wide interior and partially open ceiling allow sunlight to filter in, creating a distinctive blue light effect. The site is accessed by a short boat ride from the port and is described as suitable for beginners during its operating season.
Where Is Atami Kosoga Cave?
Atami Kosoga Cave Planning Details
Depth range, seasonality, and planning context.
Reported Depth
6m - 12m
Depth Note
Semi-enclosed cave reported at 6–12 m depth and about 40 m in length.
Best Season
Nov–Apr.
Safety & Access At Atami Kosoga Cave
Hazards, restrictions, and access requirements.
Key Hazards
Safety Notes
Semi-enclosed cave environment; maintain appropriate cave-diving precautions and stay within training/comfort limits.
Access Restrictions
Open Nov–Apr.
Local Intel For Atami Kosoga Cave
Community notes to help plan your visit.
Scuba
Beginner-friendly depths (6–12 m) with a 40 m semi-enclosed cavern and strong ambient light from the open ceiling.
Atami Kosoga Cave Dive Conditions Planner
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Exposure Profile at Atami Kosoga Cave
Directional shelter context for incoming swell.
Recent Logged Visits At Atami Kosoga Cave
Community dive logs and visit reports for this site.
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Dive Spot Log Averages At Atami Kosoga Cave
Average conditions based on logged dives & visits.
Atami Kosoga Cave Guide - Sources and Updates
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