If I understand correctly, when they are pinging, they are not listening. However, they are able to switch back and forth so quickly that you don't notice, and they seem to be pinging and listening at the same time.
Aside from that, you have two or more up there looking for you. One is pinging you, and the other is listening.
Get as deep as you can, and as quiet as you can. Keep the RPMs on the propellers low (either below 100 RPM or 50 RPM, I don't remember). Work your way out to deep water. Pay attention to where the enemy is. When they come over you to drop charges, run. They already know where you are, so you're not giving anything away. Go to flank, change depth, change heading, and drop back to slow speed. Change direction, but always keep heading for deeper water.
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