I would vote to make periscope at night nearly invisible or even totally invisible.
As this could sound like nonsense, it will be much more relevant according to many documentaries about convoy attacks. At the night, sub was nearly invisible even if it was emerged in the middle of convoy between the ships.
As convoy tried to be invisible from distance, they was totally dark.
When sub attacked, they tried to use spotlights, but mostly without any success as they had no idea from which point attack started.
Periscope was really invisible in such situation
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