Hawaii, United States
    Waikiki Marine Life Conservation District

    YO-257

    Best months: Jul–Sep

    Protected Area

    Waikiki Marine Life Conservation District

    Why dive here

    YO-257 is a wreck dive where divers can encounter blue sharks, sea turtles and sperm whales. Water ranges 25-28°C, warmest August, September, October.

    Best timeJul–Sep
    WetsuitA 3mm shorty or thin full wetsuit
    Marine lifeBlue Sharks, Sea Turtles and Sperm Whales
    Water25-28°C · warmest August, September, October
    CharacterWreck dive

    The YO-257 is our go-to wreck dive when we’re on Oahu, and for good reason. She’s a former Navy oiler, deliberately sunk as an artificial reef, and she sits upright and intact at around 30 metres. What we love about her is the penetration opportunities – the engine room is particularly cool, with light filtering in through various openings, creating this really moody, atmospheric dive. You’ll often find white tip reef sharks napping on the deck, tucked into sheltered spots, and the resident eagle rays make regular passes, gliding overhead with that distinctive, slow wingbeat. We’d suggest hitting this site early, before the crowds, as it can get busy. The current is usually pretty mild, but it's always worth a check. Keep an eye out for the schooling snapper that swirl around the superstructure, a shimmering silver cloud you can practically swim through. It’s a proper wreck dive, best for those comfortable with a bit of depth and keen on exploring interiors.

    Safety Notes

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

    Today05:2617:1211h 46m daylightGolden hour 16:42

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    Conditions

    Ocean conditions, forecast and tides for YO-257

    YO-257 Ocean Conditions

    Monthly averages for YO-257, sourced from Open-Meteo marine data + Copernicus Marine (EU) - nearest station: Open-Meteo marine grid (20.73, -156.95) (9km away)

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    October Averages

    Sea Temperature

    27°C

    81°F · Range: 26.7–28.4°C

    Current Speed

    11.31 cm/s

    Direction: NW (315°)

    Chlorophyll-a

    0.035 mg/m³

    Very clear (oligotrophic)

    Salinity

    35.58 PSU

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

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