Tuna Cave
Also known as: Maguro Ana
Best time to dive
May to September; February to April
What you might see
- Dogtooth tunaLikely
- DolphinLikely
- Eagle rayPeak season
- Grey reef sharkLikely
- Manta rayLikely
- Sea turtleLikely
- Tiger sharkLikely
- Whale sharkLikely
Sightings are seasonal probabilities, not promises - even in peak season nature does its own thing.
Certification & difficulty
Advanced Open Water - advanced conditions (currents/depth); dive within your training.
Snorkelling
Snorkel-friendly - snorkeling is offered elsewhere around Chichijima/Ogasawara (e.g. with dolphins), but not specifically documented at Tuna Cave itself due to depth/current - likely dive-only
Safety notes
strong/unpredictable currents, remote boat-only access (far from immediate surface support), depth of surrounding hall, long transit from Chichijima harbor
Permits & fees
- (no specific per-dive fee found; general Ogasawara National Park 'Country Code' visitor rules apply via the Ministry of the Environment, but no documented cash fee for this dive site)
Permits and operators change - confirm before booking.
Location
Nearest hub: Chichijima
This profile is desk research, compiled from public sources - not a first-hand dive report. Coordinates are approximate.