So...
1. Combined sound from convoys should travel longer... checked.
2. DDs should have realistic number of DC... checked.
3. Depth charges should hinder passive detection... checked.
But what about hiding inside a convoy and using wrecks as a sound screen? Ok I know that the sub has a specific noise that can be picked up even if it overlaps the sound of a merchant, but each knot of speed is important when dodging DDs and I doubt that any sound man could pick up a 2/3d's running sub on top of a flank running (and panicked) merchant.
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