Keep your boat at silent running, do not go faster than 1 knot. this helps to make the DDs "deaf" to your presence. I know the Type II boats can remain silent at 2 knots.
Steer your boat toward deeper water, making random turns from time to time, to avoid being tracked on a straight line.
Unless you're flooding, I'd suspend repairs to keep the noise down and do not exceed 2 knots in speed or the destroyers will pick up your engine/propeller noise. You can use bursts of speed to draw their attention and then immediately set all stop while making a tight turn, drifting away from where they think you are.
Too many kaleuns here have lost their lives because they lost their nerve and tried to use speed to get away. Kind of pointless, when you think about it. Even if you could get away with flank speed, that's a max of 7 or 8 knots submerged vs. the destroyer's max speed of 25-34 knots.
You have to be as quiet and elusive as a ghost.
I once endured being hunted by four escorts for 14 hours, game time. There's a certain satisfaction in finally being able to surface and limping home in your battered and leaking u-boat, knowing you'll live to fight another day.
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Still sailing the high seas, hunting convoys with those who join me.
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