Rio De Janeiro Maru
Conditions & tides
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Marine forecast via Copernicus Marine. Score is a rule-based guide from swell/wind vs. the site's exposure — always dive your own assessment.
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About this site
The Rio de Janeiro Maru is a large passenger-cargo ship wreck in Truk Lagoon, over 450 feet long. It is one of the deeper recreational dives in the lagoon, with depths from 60 to 130 feet (18 to 40 m).
Structure. The bow is one of the most striking parts, with its anchor chains and a large deck gun still in place, and it is covered in soft corals. The towering superstructure rises above the decks. The cargo holds contain trucks, aircraft parts and other wartime supplies. At the stern the propeller is still intact and is a popular spot, often surrounded by schools of fish.
Large schools of fish, including barracuda and jacks, patrol the wreck. The structure has many nooks and crannies for smaller species such as gobies and blennies.
Marine life here
Confirmed by our research team, reported by independent divers, or observed nearby via iNaturalist — each entry is labelled with its source.
BarracudaBarracudaReported here · unconfirmed
Lined BristletoothCtenochaetus striatusReported here · unconfirmed
Bleeker's ParrotfishChlorurus bleekeriReported here · unconfirmed
Masked RabbitfishSiganus puellusReported here · unconfirmed
Whitetail SurgeonfishAcanthurus thompsoniReported here · unconfirmed
Surf ParrotfishScarus rivulatusReported here · unconfirmed
Humpnose Bigeye BreamMonotaxis grandoculisReported here · unconfirmed
Yellow-barred ParrotfishScarus dimidiatusReported here · unconfirmed
Peacock DamselPomacentrus pavoObserved near here · iNaturalist
Bluefin TrevallyCaranx melampygusObserved near here · iNaturalist
Bigeye TrevallyCaranx sexfasciatusObserved near here · iNaturalist
Threadfin ButterflyfishChaetodon aurigaObserved near here · iNaturalist
Durable tips from divers — access, hazards, marine life, facilities. For day-of conditions, use the report tool in the conditions card above.
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