atami-marine.com · Operator
Operator page covering seasonal access, beginner suitability, and facilities.
Dive Spot Guide•
Atami Kosoga Cave
Seasonal boat cavern dive near Atami Port.
Scuba DivingBoatBeginner
Cave
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Local operator required
Access depends on a local boat operator and the seasonal opening window.
Short boat access and a bright overhead cavern make this a beginner-friendly Atami dive when the sea is calm enough to open the point.
About Atami Kosoga Cave
Atami Kosoga Cave is a seasonal boat cavern near Atami Port with a bright open ceiling and a calm, beginner-friendly feel when the operator opens it. The site is a compact, light-filled overhead room rather than a deep or wide-open drift, so it suits divers who want simple navigation, clear structure, and an easy boat-based day plan. On a settled day, the short approach from the port and the sheltered cavern shape make it one of Atami's most approachable seasonal point dives.
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Research Estimate At Atami Kosoga Cave
Conservative baseline from public research. No community dives logged yet.
VisibilityVisibility: 10m
AccessModerate entry effort
Aquatic LifeGreat variety
FacilitiesGood facilities
Where Is Atami Kosoga Cave?
This spotNearby spots
Community sourced coordinates.
Atami Kosoga Cave Planning Details
Depth range, seasonality, and planning context.
Reported Depth
6m - 12m
Depth Note
Published descriptions place the semi-enclosed tunnel around forty metres long and roughly 6 to 12 metres deep.
Best Season
Late autumn through early spring.
Typical Conditions
Bright cavern light, manageable boat access, and a relaxed beginner profile when the sea is settled.
Safety & Access At Atami Kosoga Cave
Hazards, restrictions, and access requirements.
Key Hazards
Overhead environment
Safety Notes
Overhead awareness matters on the entry and exit, and the site should be treated as weather-sensitive rather than a casual open-water stop.
Access Restrictions
Boat access only, seasonal opening, and operator approval tied to sea state.
Legal Notes
Follow the operator's seasonal window, briefing rules, and light-use requirements.
Local Intel For Atami Kosoga Cave
Community notes to help plan your visit.
Scuba Diving
Guided scuba is the natural fit. The point is shallow enough to feel relaxed, but the overhead cavern profile still demands standard cave-awareness habits.
Freediving
Not a casual freedive spot. The overhead cavern and boat access make guided scuba a better fit for most visitors.
Snorkeling
Not a primary snorkel point for casual surface exploration; it is set up as a guided dive site.
Atami Kosoga Cave Dive Conditions Planner
Use the planner to scan this week, inspect today in local time, and understand how exposure shapes conditions at Atami Kosoga Cave.
Current Snapshot
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🌥️Variable
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Surface / Entry
Wind No data · Tide No data
Sea State
Swell No data · Period unavailable
Visibility Outlook
Rain chance No data
Wind
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Swell
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Exposure Profile at Atami Kosoga Cave
Directional shelter context for incoming swell.
Exposure Note
Hourly forecast data is not available yet.
Wildlife at Atami Kosoga Cave
Species commonly reported at this site, with direct links into their wildlife guides.
Recent Logged Visits At Atami Kosoga Cave
Community dive logs and visit reports for this site.
No Dive Logs Yet
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Dive Spot Log Averages At Atami Kosoga Cave
Average conditions based on logged dives & visits.
Conditions
Avg. Visibility10m
Activity
No dive activity logged yet.
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Atami Kosoga Cave Guide - Frequently Asked Questions
Planning answers for access, conditions, timing, and site logistics.
Atami Kosoga Cave Guide - Sources and Updates
Last Updated
Research Sources
www.atami.biz · Tourism
Local tourism page with tunnel length, depth range, and seasonal window.
www.japan.travel · Official Tourism
National tourism guide for Atami cavern-diving context and seasonality.
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