Chuuk (Truk) Lagoon, Micronesia

    HEIHAN 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 - HEIHAN 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 Heihan Maru, she's a big girl. At 155 metres, you’ll be doing multiple dives to properly take her in, and we think she’s absolutely worth it. What makes her a standout for us isn't just the sheer scale, it's the sheer variety. We love dropping down into the immense holds, where you can still make out the ghostly outlines of tanks and other cargo. It’s a completely different vibe from the engine room, which feels almost cathedral-like with the light shafts cutting through the gloom. You’ll find something new on every pass – a porcelain toilet still intact in the crew quarters, or a scattering of gas masks. For marine life, keep an eye on the bow and stern sections, especially around the masts. They’re usually draped in soft corals, and you’ll often find schools of fusiliers swirling so thick they practically block out the sun. It’s also a good spot for lionfish and the occasional reef shark cruising by. Our best advice? Take your time. Don't rush through; there's too much history here to just tick off the big items. Try to hit the holds around midday for the best light penetration. This is a site that truly rewards careful, repeated exploration, a must for anyone serious about wreck diving.

    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 HEIHAN MARU

    HEIHAN MARU Ocean Conditions

    Monthly averages for HEIHAN 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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