What about something like: "Keep up the good work!... unless you've been seriously hit, in which case please reach the closest possible location with firendly repair facilities and fix up your boat... then again, if your sub is really... and I mean REALLY screwed up, like it won't ever sail again, and you fear you might get caught by the tommies, then SCUTTLE! we will remember your bravery Herr Kaleun. If, on the other hand, your sub seems to be sailing along just fine, with some minor damage, and you're thinking about returning home to give that good old crew some rest... DON'T EVEN THINK ABOUT IT! Re-engage convoy and... BE MORE AGGRESIVE!!!"
