I've often wondered & now I'm finally getting around to asking this question; you don't hear them of course but are merchant's distress calls modelled/simulated in the game? For example, you spot an unarmed merchant on the surface & decide to chase them down & destroy them with the deck gun; is the merchant vessel able to alert any nearby but unseen (by you) friendly units? I usually target the lower hull & waterline with the deck gun to ensure the quickest sinking but in reality the U-boat's gun crew would try to destroy their intended victim's radio room & radio antenna mast asap to prevent the victim from sending a distress call.
Thanks...
