YO-257
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.
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.
Nearest Dive Centres to YO-257
Dive shops near YO-257
Waikiki Dive Center
Ocean Therapy Scuba
Green Dolphin Dive Shop
Aloha Scuba Diving Company
Breeze Hawaii Diving Adventures
Honolulu Scuba Company
Reviews for YO-257
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)
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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