Jonathan,
in most cases, depth is your friend. This is because ASDIC on escorts works in a "field" in a fixed angle from the ship. Therefor, the deeper you are, the farther away an escort looses your pingback from its ASDIC. So to a much longer time and degree, an escort then has to guess where you are when he presumably passes over you to drop dc's.
Therefor: when te pinging stops when an escort approaches you: ahead full flank if you aren't already, 10 meters deeper if possible and right/left full rudder, making a knuckle of 90 degrees to your original course.
Because of the depth, the dc's also take some time to come to your depth, so odds are that:
-a. you are not at the place (or even ever were) where the dc's explode
-b. you are not in the place where the escort now expects you to be.
After the explosions, go back to silent. With luck, the escort turns away in the same direction you did, so you have some time in its baffles, further decreasing the chance he will pick you up again.
The fun really starts when multiple escorts work together, one of them keeping contact while the rest makes accurate passes (since they now DO know where you are all the time, also on final approach). In my experience, EVERYTHING you do should be geared towards avoiding just that, even more so than sinking tonnage.
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