Once wolfpacks developed they deployed in bredth and in depth. After a certain amount of time, if they calculated they convoy should have passed, they would move backwards along the path of the convoy in the same formation.
I weeks went by and no contacts were found in an area, BDU might move the pickets into a different area.
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U.Kdt.Hdb B. I. 28) This possibility of using the hydrophone to help in detecting surface ships should, however, be restricted to those cases where the submarine is unavoidably compelled to stay below the surface.
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