LCU is a deep south-shore Oahu wreck dive on an upside-down landing craft that now functions as an artificial reef. The dive is about reading the hull, the rubble plain, and the blocks that have turned into fish habitat rather than chasing big swim-through drama. It is a boat-only site for certified divers who are comfortable with depth and a conservative profile. Pick the day carefully, because tide changes and south swell can make the site feel much bigger than the wreck itself.