- Movie Goof (factual errors): The hatch on the U-Boot is oval with a wing-nut dogging lever. U-Boot bulkhead hatches were circular with a wheel to operate the dogging mechanism.
- Movie Goof (anachronisms): The German sub's 2WO (2nd Watch Officer) is wearing the uniform coat of an enlisted artilleryman of the German Federal Army. This specific design was not issued until the late 1960s/ early '70s and would not have been worn in WWII, and certainly not by a naval officer.
- Movie Goof (factual errors): Several times men are shown smoking inside a submarine, which wouldn't happen in WWII due to the fire hazard it presents. The air in a diesel/electric-powered sub (US or German) would be full of oil vapor and/or hydrogen from the batteries and extremely flammable. Smoking was allowed only on the upper deck for this reason.
- Movie Goof (factual errors): While the sub is being submerged, several radio communications (voice and Morse) happen. While nowadays datagrams are possible, consuming a significant amount of time, during WWII subs had to surface, or at least go to periscope depth, to send or receive radio transmissions.
View All: Trivia - Goofs - Quotes
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