 Late one night, the crew hears loud music emanating from Captain Murphy s room. When they interrupt him, they discover a cache of recently purchased valuables. Murphy has actually charged all these purchases on a credit card, which Sparks convinced him to get. Sparks had told Murphy that the credit card was magical. When Murphy discovers otherwise (that he s under a mountain of debt), he sends the Sealab crew on a dangerous mission to find sunken treasure. Secretly, Sparks has taken out life insurance policies on the crew.