I must say that I am somewhat surprised that they cannot hear you when you are on the surface. Although I do not know the location of the hydrophones on a DD, unlike your uboat, the DD's hydrophones are always underwater listening so why would then not be able to hear you?
You can hear surface traffic when you are just submerged (8m, but hydrophone shallower) and I suppose their hydrophones are about 2-3m down. The deeper you go, the better you can hear (notwithstanding the thermalcline, is that modeled in SH3?) because you can get away from the surface noise.
Of course weather, speed etc would play a part, but a stationary DD in calm seas I would think, could hear quite far away with their hydrophones and certainly pick up surface traffic.
I really don't know much about the technology at the time, this is just how I always thought of it. Am I missing something? Or am I wrong and the only way a DD can "see" you on the surface is visually or radar?
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