I agree with GoldenRivet - let them pass and make like a hole in the water!
If they have detected you, use a magnetic torpedo in the aft torpedo tubes set for 0.5m under their keel. Run like hell away from them and wait for them to follow. Early on in the war you can hit them at max range, later on you need to wait for them to get to 500m or less - at 500m they will straighten out their run to try and depth charge you. All it takes is minor course changes to ensure they stay at 180 degrees to you and you can pick them off.
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