No, I always figure the further you are away, and that includes vertical distance, the fainter your sound would be. My fighting style is to stay as close to the surface as I can, however, so I usually duck just beneath the layer. I want to be able to quickly pop up to periscope depth with intent to do great harm. A sub at 1000' with its tail between its legs is no danger to anyone but its crew. Be dangerous, I say!
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