In real life, a fully underwater attack without the the aid of the periscope never took place in combat in WWII.
Maybe the Germans did it in training, and there is a story about a simulated attack in the last days of the war, but a real fully submerged attack never took place in WWII.
Additionally, when England sank the Argentine Cruise during the Falklands War, the captain of the British sub confirmed his firing data through the periscope.
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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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