Japan · Atami, east Izu Peninsula
Kosoga Cave
Best time to dive
January to December; June to September
What you might see
- Hammerhead sharkLikely
- Sea turtleLikely
Sightings are seasonal probabilities, not promises - even in peak season nature does its own thing.
Certification & difficulty
Technical - advanced conditions (currents/depth); dive within your training.
Snorkelling
Not a snorkel site - No - overhead cave/cavern
Safety notes
Season-dependent; standard dive precautions; overhead environment - light and guide
Permits & fees
Beach or boat dive on the Izu Peninsula / Sagami Bay
Permits and operators change - confirm before booking.
Location
Nearest hub: Atami
This profile is desk research, compiled from public sources - not a first-hand dive report. Coordinates are approximate.