Yes I've had that happen to me, crew says ship spotted, I take a look and it's a damn destroyer, "
Alarm".

I must mention this, got confronted in heavy fog twice by destroyers during the same patrol, sustained damage each time but got through, doesn't half scare the crap out of ya when you do an external view and the DD is right on top of you, the second time it hit the aft section, and I rolled some, but as I said got through it!!