Apo Reef, Philippines

    Olympia Maru

    Best months: Oct–Feb

    Why dive here

    With 176+ marine species recorded in the area - including giant moray eels, sea turtles, sperm whales, lionfish and pufferfish - Olympia Maru offers some of Apo Reef's richest wreck diving. Water ranges 28-30°C, warmest May, June, July.

    Best timeOct–Feb
    WetsuitA 3mm shorty or thin full wetsuit
    Marine lifeGiant Moray Eels, Sea Turtles, Sperm Whales, Lionfish and Pufferfish · 176+ species recorded
    Water28-30°C · warmest May, June, July
    CharacterWreck dive
    StandoutExceptional marine biodiversity

    The Olympia Maru is our favourite wreck dive in Apo Reef, hands down. It’s got that perfect blend of history and biology, a real living museum. This Japanese freighter, sunk during WWII, now rests on its side, split into three main sections. You can really feel the scale of it as you descend, the sheer bulk of the metal hull appearing out of the blue. We usually start at the stern, where the propeller is still intact, encrusted with so many sponges and soft corals it looks like a giant, ornate flower. As you move along the deck, you’ll spot lionfish tucked into every nook and cranny, and often a few big groupers peering out from shadowed cargo holds. The mid-section offers some penetrations for experienced divers, though we’d suggest keeping it external if the current is up, which it often is here. The bow is particularly scenic, often swarming with schools of fusiliers and yellowtail snappers, their bodies flashing in the sunlight filtering down. For anyone who appreciates a wreck that's fully embraced by the reef, this one is special.

    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 Olympia Maru

    Olympia Maru Ocean Conditions

    Monthly averages for Olympia Maru, sourced from Open-Meteo marine data + Copernicus Marine (EU) - nearest station: Open-Meteo marine grid (12.33, 121.06) (26km away)

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    October Averages

    Sea Temperature

    30°C

    86°F · Range: 28.1–31.3°C

    Current Speed

    3.16 cm/s

    Direction: E (108.4°)

    Chlorophyll-a

    0.049 mg/m³

    Very clear (oligotrophic)

    Salinity

    32.63 PSU

    Based on 4 years of monitoring data · Data sources: Open-Meteo marine data + Copernicus Marine (EU)

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