At last 1.5 in
 

Finally got my hands on the u-boat add-on. Had only enough ime to uninstall SH and re-install and add in the add-on. Ran it a bit and all is ok. Now only thing to find is the compatible mods, particularly he environmental ones. I did load in RFB and the German voice mod, but it seems that the voices remain with a North American accent. Somebody tell what I'm doing wrong.