Chuuk (Truk) Lagoon, Micronesia

    Rio de janeiro Maru

    Best months: Jan–May

    Why dive here

    With 195+ marine species recorded in the area - including barracuda, blacktip reef sharks, eagle rays, grey reef sharks and whitetip reef sharks - Rio de janeiro Maru offers some of Chuuk (Truk) Lagoon's richest wreck diving. Water ranges 29-30°C, warmest August, October, November.

    Best timeJan–May
    WetsuitA 3mm shorty or thin full wetsuit
    Marine lifeBarracuda, Blacktip Reef Sharks, Eagle Rays, Grey Reef Sharks and Whitetip Reef Sharks · 195+ species recorded
    Water29-30°C · warmest August, October, November
    CharacterWreck dive
    StandoutExceptional marine biodiversity

    The *Rio de Janeiro Maru* is one of those wrecks that just clicks with us. It’s an enormous passenger-cargo vessel, over 140 meters long, lying on its starboard side, and it’s been well picked over by time and divers. We love poking around the upper decks, which sit in the shallower end of the dive, maybe 10 to 15 meters. Here, the sunlight really penetrates, illuminating sections of the promenade deck now covered in large plates of bracket coral. It’s a good spot to linger and watch the schools of fusiliers darting in and out of the superstructure. What we really enjoy, though, is the sheer scale of the cargo holds. Dropping into hold number 2, you're immediately struck by the rows of sake bottles still neatly stacked – a genuinely eerie sight. Further down, in holds 3 and 4, there are these huge steamrollers and trucks, just massive pieces of equipment that really give you a sense of the ship’s original purpose. Our favourite part has to be the engine room, though. It’s a bit of a squeeze to get into the deeper parts, but the massive engine components are captivating, and you often find big eye trevally circling in the gloom. This is a wreck for divers who appreciate history and don’t mind extended penetration – just make sure your buoyancy is dialled in.

    Safety Notes

    Wreck site - avoid penetration without wreck diving certification. Watch for sharp metal and entanglement hazards.

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    Conditions

    Ocean conditions, forecast and tides for Rio de janeiro Maru

    Rio de janeiro Maru Ocean Conditions

    Monthly averages for Rio de janeiro Maru, sourced from Open-Meteo marine data - nearest station: Open-Meteo marine grid (7.41, 151.84) (2km away)

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    October Averages

    Sea Temperature

    30°C

    86°F · Range: 29.3–31.4°C

    Air Temperature

    28°C

    82°F

    Wind Speed

    6.4 m/s

    12.4 knots

    Atmospheric Pressure

    1009.4 hPa

    Based on 4 years of monitoring data · Data sources: Open-Meteo marine data

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