The crew of the Endeavour sails Australia's Great Barrier Reef conducting scientific studies and having adventures.
Ted King was captain, and Tracey Deane was a scientist on board who used the Minus 5 Computer to calculate data. First mate was Jack Meuramki, who always did the dives, while Diana Parker was the computer operator. Dr Hanna was a research scientist and Steve was a crew member.
The underwater footage used was filmed by cinematographer Ron Taylor.