Shark's Cove (Pupukea) is heavily used for training purposes. Just outside the cove to the right, there are a number of lava tubes and ledges that make for some interesting exploring, but at least 4 people have died in one of the caves. Extreme caution and training are urged. Due to high winter surf, the coral here is somewhat lacking, but the underwater topography and marine life make up for it. Only diveable in the summertime (typically). Marine reserve, so collecting is not allowed.