I remember an article in a magazine about that, or something similar...
U-117 had an on-board sound system, it would play a whole series of commands and general sub talk, all in German, of course...then as a finale it played Klaus Doldinger's introduction to the theme music from "Das Boot".
I did record Bernie Wood speaking in German, but decided against adding that to the tape...just in case any spectators spoke fluent German! Didn't want to be responsible for starting WW111...
Rich