In heavy fog, you should always stay submerged, just like in real life.
When a DD is charging you at 35kts in 200m visiblity you are in big trouble regardless of the TC.
Stay submerged in heavy fog and you will be safe.
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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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