Corrected entry: When the DSRV docks to the Red October, the crew let the October know they are docked by hitting the hatch with a hammer. However, the hammer used is a normal wood and steel hammer, the kind you could buy in any hardware store. Hammers, indeed, all tools on board submarines, are coated with a thin layer of plastic so as to minimize the amount of sound they make if they get banged around.
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Correction: Not true. I had a friend stationed on the very DSRV used in the movie, and I have been in it myself. Since this type of vehicle is used for rescue the hammer is not coated. They want to make noise.
papajim