The crux of The Last Dive is the story of an oft-bickering father and son. Chris Rouse is a demanding perfectionist; his son Chrissy is free-spirited and cavalier. Chris and Chrissy share an intense love of diving and for each other. Referee to their co-dependence is Sue Rouse, wife of Chris and mother of Chrissy. Chris and Chrissy are fabulously talented divers who graduate from cave diving in controlled waters to wreck diving in the open seas. Even the best of divers, however, suffer the worst of fates. Such is the nature of the game.