If you start hearing screw noises from the hunting DD's, make a 10 degree turn to either starboard or port until you are heading about 30 to 40 degrees away from their path. This is better than using full rudder as it will keep your speed from dropping. When you hear the splashes from the DC's hit flank speed and steer 10 degrees the other way.
It won;t do much but at least you'll feel like you are doing something
After the last DC explodes you have about 30 seconds before they can hear you again so sty at flank for no longer than that time.
If there are more than one hunting you I suggest you make silent speed for most of the time until you can creep away. Alternatively if you have a torp or to get back to PD and have a crack at sinking one or two of them. It might even the odds a little and at least you'll feel like you arr fighting back.
