I wait until after I attack to radio in my patrol report. I reason that my attack on a convoy or lone merchantman has already been radioed in, so the Admiralty already know there is a U-boat in the area. Then I hightail it out of there; sometimes I will submerge and skulk away, but usually I will make a high speed surface run for a few hours. If it is daylight, or nighttime when the Allies have radar I will keep a very close watch on the skies.
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