The file
WeO_K_Firing_tube_5.ogg in the
Das Boot soundmod ('B-Sound-Add-on' at
http://sh3sounds.realsimulation.com) contains an unspecific "Los".
Before copying all files into your speech-directory check the larger files, as some are quite tedious; e.g. the more or less complete damage reports from the movie!
Cheers
Kai