Im open to the idea of being wrong.
But i have found through my experience that the escorts have no notable difficulty in finding you with asdic at periscope depth or at shallow depths.
As far as im aware the game logic either figures your under the water or you're not. :hmm:
Also, in this same regard, i think that the game logic does not allow you to mask your noise using the noise of other ships.
hopefully someone who knows for sure can chime in.
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