What would be the point? At the depths and the conditions the subs normally operate under, you would see just as much if there wasn't any windows. They don't have external lighting.
And IIRC, those windows are for maneuvering the boat while it is in harbor, allowing the crew to remain indoors but still see whats going on outside. This I'm not totally sure of, people more familiar with that class of boat would know.
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Luck is a residue of Design.
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