Fourteen year-old Navy Cadet Andrew Collins enrolls in a SCUBA diving course on the Great Barrier Reef to impress Muriel, the girl of his dreams. There's only one problem: Andrew is terrified of diving, not to mention the sharks, eels, and every other dangerous critter inhabiting the Coral Sea. Despite his fears, Andrew inadvertently stumbles onto an old family mystery: the mysterious disappearance of his grandfather, lost at sea many years before...