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Hotels, dive operators, gear, and how to get here are on the Raja Ampat location page.
Overview
The Japanese battleship Nagato, a veteran of World War II and the flagship of Admiral Isoroku Yamamoto, met its final fate as a target ship during Operation Crossroads nuclear tests in Bikini Atoll in 1946. This massive super-dreadnought now rests inverted on the seabed, offering an imposing and historically significant deep wreck dive. Its sheer size and the dramatic events surrounding its sinking make it a poignant underwater monument.
Briefing note
Diving in Bikini Atoll requires special permits due to its historical significance and ongoing radiological monitoring. Divers must be qualified for technical diving due to the depth of the wrecks. Strict regulations and health advisories are in place.
What you'll see
4 species curated- year-roundGrey Reef Shark
- year-roundTuna
- year-roundBarracuda
- year-roundSnapper
Sightings evidence
1 record on file- high confidenceGrey Reef Shark
- Last confirmed
- May 2026
- Recent records
- 130 within 10 km
Sources & methodology
How we summarise this
We aggregate confirmed occurrence records from GBIF and OBIS within a fixed radius of each dive site. Occurrence records confirm presence and reveal seasonality clustering, but they DO NOT measure per-dive probability — there is no eligible-effort denominator. We deliberately do not publish a numeric '% chance of sighting' from this data.
Sources
- Global Biodiversity Information Facility — GBIF Secretariat
- Ocean Biodiversity Information System — IOC-UNESCO
- iNaturalist — California Academy of Sciences & National Geographic Society
- IUCN Red List of Threatened Species — International Union for Conservation of Nature
- Wildbook (Sharkbook, Whale Shark, Manta Matcher) — Wild Me
- OBIS-SEAMAP — Duke University Marine Geospatial Ecology Lab / OBIS
- WoRMS — World Register of Marine Species — Flanders Marine Institute (VLIZ)
- FishBase — FishBase Consortium
- Atlas of Living Australia — CSIRO / GBIF Australia
- REEF Volunteer Fish Survey — Reef Environmental Education Foundation
Conditions
| Month | Water | Visibility | Current |
|---|---|---|---|
| Jan | 27–30 °C | 20–40 m | moderate |
| Feb | 27–30 °C | 20–40 m | moderate |
| Mar | 27–30 °C | 20–40 m | moderate |
| Apr | 27–30 °C | 20–40 m | moderate |
| May | 27–30 °C | 20–40 m | moderate |
| Jun | 27–30 °C | 20–40 m | moderate |
| Jul | 27–30 °C | 20–40 m | moderate |
| Aug | 27–30 °C | 20–40 m | moderate |
| Sep | 27–30 °C | 20–40 m | moderate |
| Oct | 27–30 °C | 20–40 m | moderate |
| Nov | 27–30 °C | 20–40 m | moderate |
| Dec | 27–30 °C | 20–40 m | moderate |
Season calendar
Next step
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