One thing I have learned and remembered since Silent Service on my PCjr (yes I was the one) was always stay submerged in heavy fog.
In SH3
1939 to 1941: Surfaced. Sounchecks at dawn and dusk.
1942: Submerged by day surfaced by night.
1943: Submerged by night, surfaced by day.
1944 to 1945: Submerged
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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.
http://www.hackworth.com/
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