Changes made from the Alistair MacLean source novel of the same name for this film included the name of the nuclear submarine, the Dolphin, which was re-named the USS Tigerfish (with the vessel number of SSN-509) and the names of two characters: Submarine Commander Swanson became Commander Ferraday (played by Rock Hudson) and spy Dr. Carpenter became David Jones (played by Patrick McGoohan).

Film

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