Continuity mistake: When they are attempting to get "between the screws" of the tanker, the underwater footage shows twin screws, but the surface footage only shows wake from 1 single mid-ship propeller.
Down Periscope (1996)
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Directed by: David S. Ward
Starring: Bruce Dern, Kelsey Grammer, Rip Torn, Rob Schneider, Harry Dean Stanton, Lauren Holly
Genres: Comedy
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More mistakes in Down Periscope
Pascal: Buckman! There was a fingernail in my food, you fat-ass moron! Yesterday, it was a band-aid!
Buckman: I'm sorry, sir. The band-aid was holding the fingernail on.
Trivia: In the scene when Lauren Holly, gives Kelsey Grammer, a kiss, her hitting her elbow was not in the original script. She really did hit her "funny bone" before walking off camera. The director had decided to keep it in the movie so they had to film an alternate shot of Grammer, laughing when it happened.
Question: Would pouring whiskey into the tank have really thinned down the mix, giving the submarine more speed?
Answer: Adding alcohol to gasoline can lower the fuel's viscosity, thinning it to flow more easily. It can only marginally increase an engine's speed and power.
raywest ★
But the question was, would it have actually increased the sub's speed?
Thinning the fuel mix would not increase energy or performance, so it would not make the submarine faster.
Technically, yes, diesel with alcohol burns better. As for what happened in the movie: no. Whiskey is not alcohol; it's water with alcohol, and the water reduces the flammability a lot. Also, a sub has fuel tanks that hold tens of thousands of gallons; adding a few ounces of whiskey will not have any effect at all.