Chuuk (Truk) Lagoon, Micronesia

    Haian 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 - Haian 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 Haian Maru feels like stepping into a ghost story. We love this wreck because it’s surprisingly intact, sitting upright, and so accessible. You can slip into the holds and find heaps of sake bottles, still in their wooden crates, a real eerie glimpse into the past. Down in the engine room, shafts of light pierce through, illuminating schools of glassfish that shimmer around the machinery. Our favourite part has to be the stern, where the prop is still in place and big schools of unicornfish often mill about. We’d suggest going early in the morning, before other boats stir up the sediment, for the best visibility inside. It’s a site that really makes you slow down, absorbing the history and the way the reef has completely reclaimed the ship. You’ll find plenty of black sea cucumbers draped across the decks, and we’ve seen some huge parrotfish grazing on the coral growth.

    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 Haian Maru

    Haian Maru Ocean Conditions

    Monthly averages for Haian 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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