This is pretty cool, although as I actually speak some German the Das Boot soundbites get a little repetative and inappropriate. (hearing the old man say 'we'll stay submerged' while running on the surface is a bit weird and the chat about horse dung having a good life gets old after hearing it 20 times an hour
)
but the atmosphere, dive routines, eardrum-friendly engine telegraph, occlusion of 'jawohl herr kaleun' etc etc are all really good!
all in all, a nice immersion mod which seems to work well with GWX 3.0
good job, sir