YO-257 & San Pedro Wrecks – Hawaii – Oahu

33m Max

15-30m Vis

boat

Site Overview

The YO-257 and San Pedro are twin wrecks deliberately sunk as artificial reefs off the south shore of Oahu creating one of Hawaii's most productive wreck diving experiences. The YO-257 is a former US Navy oiler sitting upright at 33 meters while the San Pedro is a landing craft positioned nearby allowing divers to explore both wrecks on a single dive. The structures have become thriving artificial reefs supporting dense communities of tropical fish, moray eels, and seasonal eagle rays. Whitetip reef sharks patrol the deeper sections while barracuda schools hunt around the superstructure. The wrecks provide exceptional penetration opportunities for certified divers with large open cargo holds and engine rooms creating dramatic light effects and underwater photography opportunities. The twin wreck configuration is unique among Hawaiian artificial reefs allowing divers to experience two distinct wreck environments on a single dive. The YO-257 served as a Navy oiler before being sunk while the San Pedro landing craft represents a different era of military maritime history. Together they create an underwater museum documenting naval heritage while supporting thriving marine ecosystems. Marine biologists have catalogued extensive communities of encrusting organisms on both hulls providing valuable data on artificial reef development in tropical Pacific waters.

Dive Briefing

"Descend the mooring line to the YO-257 deck at approximately 25 meters and explore the exterior superstructure before entering the cargo holds. Swim to the nearby San Pedro wreck approximately 30 meters away at similar depth. The wrecks sit on sandy bottom attracting eagle rays and the space between them often hosts whitetip reef sharks. Plan your dive to include both wrecks within your no-decompression limits using nitrox if available. Ascend the mooring line performing a safety stop at 5 meters. The twin wreck configuration provides a unique diving experience found in few other locations worldwide. The descent to the first wreck reveals the full scale of the oiler's hull rising from the sandy bottom creating an impressive silhouette. The swim between wrecks crosses open sand where eagle rays and stingrays forage providing additional wildlife encounters between the two structures. Both wrecks have established permanent mooring buoys eliminating the need for free descent in open water."

Signature Marine Life

Eagle Ray

moderate

Aetobatus narinari

Best: April, May, June