Revealing mistake: As Patrick McGoohan walks up the steps with a homing device, a crowbar swings out and strikes him in the head. Ernest Borgnine stops the swing just before striking McGoohan's head and McGoohan's acting takes over with him jerking his head back as seen in slow motion while falling down the stairs.
David Jones: ...and all of a sudden, you know a whole damn lot about my business.
Cmdr. Ferraday: We don't believe in going on a mission totally blindfolded.
Trivia: The submarine used in the movie as a (supposed) nuclear submarine was the U.S.S. Ronquil (SS-396), a WWII Balao-class diesel-electric submarine that had received a GUPPY IIA conversion. The number painted on the sail (509) was selected because it was from a block of hull numbers canceled at the end of WWII and never used.
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