Difficult because all the names are as in the default game and don't reflect your 'Das Boot' track, but reflect the 'game situation' (batlle, neutral etc.)
Tracks are located in data\sound\Music.
I advice you to not just remove, but to substitute them with the same name, otherwise you'd have to change the music.cfg file to avoid game CTD, not sure if CTD but likely IMO (try out).
Good luck,
