If you had Asdic/Sonar it would echo the original signal. The soundman would hear it, and if he put it on the speakers the whole crew could hear it. If you had no Asdic or it was shut off you would not hear it as a signal, but the sound travelling through the water would make a noise inside the boat like "...pebbles bouncing off a roof" (I currently cannot find the source for that quote, so make of it what you will).
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