The Uboat Commanders Handbook says it should be done at 20m travelling at Silent Running.
Afterwards you should go up to PD, and have a look around.
Finally, resurface at High Speed.
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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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