You would think that would be the case due to the sea floor being noisy. you would think it would also reflect the sounds of the destroyers and make it harder for them to here you as well. As far as active sonor I guess they are aiming at anything higher then the sea floor. the top of the boat is 40 feet above the sea floor. Besides they will just debth charge your last known location. If your close to that your in for a hell of a ride. Your best bet is to creep out of there slowly. Once you get some distance Secure from silent running and run at a higer speed till you clear them. I would also immagine that DC's going off would help mask your sounds as well. I always keep moving as much as I can. Change heading often and keep them behind you.
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