That's why I wrote: "when the DD is over you" You wait until the DD is almost directly over you (the ping-ping echolot sound stops) and THEN you take full speed and turn (perferable away from DD course)! This you are doing for approx. 10sec, then back to silent run again. In this time the DD can't hear you, because you are right in his back. And as long as waterbombs are exploding keep on full speed because no DD can hear anything.
Also in early war waterbombs go maximum of 80m dive depth as far as I know, may someone can approve? And in middle of war not far more than 130m I think. So go as deep as you can. Second advantage is that the echolot is getting very bad signature of your uboot so far down.
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