It takes only a bit of annoyance and forcing me to surface and make a valorous stand against a destroyer or a petty elco boat for example. I'd even present my bridge bristling with the latest AA guns to an incomming mosquito or a litter of catalina's and burn them down without casualties 60% of the time. But a battleship's 14 inch gun shell is a big no-no. Trust me, I'm speaking from experience.
