Goofs: Errors made by characters (possibly deliberate errors by the filmmakers): Hirsch says that the sub was attacked and presumably disabled "last night at 0300 hours". This is impossible for several reasons; for one thing, the S-33 could not have been sent out when it was. He must mean the previous night.
(more) Trivia: In the original script, the German prisoner broke free twice.
(more) Filming Locations: Cinecittà Studios, Cinecittà, Rome, Lazio, Italy
(more) Quotes: Chief Klough: You're the skipper now. And the skipper always knows what to do whether he does or not.
(more) Awards: Won Oscar. Another 2 wins & 9 nominations
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