Contents: The sunlit zone; Your mission; A coral reef; Down the reef slope; A coral bloom; An artificial reef; Hidden life; Swimming with a sea giant; Flying with fish; Shark attack!; A cool ocean current; Feeding frenzy; Water and weather; The weedy Sargasso Sea; Exploring the Gulf Stream; Rich fishing; Whale watch; A red tide; The frozen ocean; Diving with seals; Mission debriefing.