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On the bottom of the ocean, uncle Jim and Jack explore the sunken yacht containing a cargo of uranium. On the surface, the crew keeps a watchful eye out for the Black Shark. Locating the heavy crate, Sally reports seeing the pirate ship on the horizon. Working hard, Jack has Billy prepare the lines to pull the uranium out.
Down below, Jack spots a real shark, and their crewman, Michel dives under the waves. Armed only with a knife, can the brave seaman fend off the shark? Can he hold his breath long enough to duel with the large fish? Jack and uncle Jim give the blow by blow details.
The coast is clear, and Jack joins the uranium as it is hoisted to the Spindrift. Now that he and uncle Jim are onboard, the focus is on evading Dr. Cheeto and his pirates.