[Sailor Steve]

This topic is verboten. The U-Boat Commander's Handbook is not to be discussed, and never questioned. You will obey orders and do as you're told.

I was never here, and you didn't hear this from me. I will self-destruct in five seconds.








Now that that's out of the way...

Since it specifically refered to the night surface attack, I think that was meant to be more of a warning than taken as fact; in other words "Never assume that you can't be heard or detected".