I think even at night it could be very effective given all of the light sources available.
It would be nice if to attack a harbo(u)r you had to get in undetected, had only a few minutes to unload all of your torpedoes and had to haul ass out to deep water before the bombs started dropping.
As it is, you are practically invulnerable as long as you don't surface. Your persicope could be high out of the water making a wake like Nessie at flank speed and they don't bother to call in any air support.
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