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Atami Kosoga Cave

Type:
Scuba Diving
Entry:⚓Boat Entry
Difficulty:Beginner
Tags:
Cave
About This Dive Spot

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.

Planning details
Reported depth and seasonality.

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
Hazards, restrictions, and required precautions.

Hazards

Overhead environment

Safety notes

Semi-enclosed cave environment; maintain appropriate cave-diving precautions and stay within training/comfort limits.

Access restrictions

Open Nov–Apr.

Where is this?
Map location of Atami Kosoga Cave
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Local intel
Community notes to help plan your visit.

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Scuba

Beginner-friendly depths (6–12 m) with a 40 m semi-enclosed cavern and strong ambient light from the open ceiling.

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Frequently Asked Questions

What's the best entry point at Atami Kosoga Cave?
Entry at Atami Kosoga Cave is detailed in the spot description above. Look for specific landmarks, access paths, and any tide or condition requirements. Local divers often share updated entry tips in their dive logs.
What conditions are best for diving Atami Kosoga Cave?
Optimal conditions at Atami Kosoga Cave depend on several factors including tide, wind, and season. Check recent dive logs for current condition reports and patterns. Generally, calmer seas and high tide provide better visibility and easier entry.
What is the maximum depth and typical visibility at Atami Kosoga Cave?
Depth and visibility information for Atami Kosoga Cave can be found in the spot details and recent dive logs. Conditions can vary significantly based on weather, tide, and season. Always plan your dive according to current conditions and your certification level.
Are there any safety considerations or local etiquette at Atami Kosoga Cave?
When diving Atami Kosoga Cave, respect local regulations, marine life, and other water users. Be aware of any specific hazards like currents or boat traffic mentioned in the spot description. Follow Leave No Trace principles and local diving etiquette.