San Pedro and the YO-257 are a classic two-wreck Oahu boat dive where divers move between a pair of artificial reefs sitting close enough together to feel like one bigger site. The draw is the contrast between intact wreck structure, open sand between the hulls, and the steady parade of turtles, schooling fish, eels, and reef sharks that use both wrecks as habitat, all at comfortable recreational depths for experienced resort and charter divers.