It's all about getting far enough outside of the active sonar cone that he doesn't pick you up when he does his sweep. Here's my trick. First, start to dive, and go ahead-1/3rd with silent running on (i.e. no compressors, crew silent, etc. - just engine noise) - and turn so that the destroyer is 180 degrees to you. This minimizes your sonar profile. Now, you have to guess as to when he'll be 1km from you. At that point, go to ahead slow. Then wait. He'll ping you. Listen to the pings - if they get louder, more frequent, then he has you. He will line up to do a DC run. Let him do this. Listen to him on the hydrophone. When he stops pinging, he will accelerate and DC you. Go flank. This will pull you down to depth (165m) and his DCs will miss because the will be set to boom too shallow to catch you. Then, when you hit 160, change course 30 degrees. The choice of direction is important. You want to turn _with_ the destroyer when he does his turn following the DC run. If you turn away, on his first turn he will have you right away in the active window. If you are under him, you will have the advantage of him having to turn 360 degrees to get you in the window. I usually flank until the rudder goes to 0, then drop to ahead 1/3rd, wait for a few seconds then go ahead slow. If all works well, you have put some distance between you and him, and he's got to turn 360 degrees to get you in the window again. With enough distance, and with the newly acquired depth, he should have a hard time picking you up on his next sweep. If he fails to find you on this next sweep, you will probably escape because by the time he does his next rotation you will be even farther away. Always keep him on the hydrphone so you know where he is. Eventually, you want to have him at 180 and fading. That's the way I escape. If there are more than 1 DD attacking you it's way harder. you have to get lucky and sprint outside of both of their active cones. Tricky, and luck-based.
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