The dockside scene, where Captain Ramsey addresses the crew, shows the U.S.S. Alabama in the background, and after his speech, the crew runs onboard. The sub was actually the U.S.S. Barbel (SS-580), a conventionally-powered (i.e. non-nuclear) attack submarine originally commissioned in 1959. The sail ("conning tower") is a plywood mock-up that generally matched the real Alabama's. Barbel's original sail not only looked different, but had already been removed (the Barbel was about to be scrapped).

Film

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