Diesels require air as well as people in the submarine therefore under water you have just so much air to breath and run diesels. Not until the schnokel was developed that diesels could be run underwater as they had an air source above the water. When this schnokel would submerge for a split second, the pressure from the diesels sucking air from inside the boat would make ears pop and hurt the lungs of the crew.
Electric engines were used on the surface. Usually leaving port. Other than that, the batteries were saved for submerged action or escape.
As far as ships using electric engines. Does not make much sense for electric on ships unless your trolling for trout.
This game does not allow you to run electrics on the surface.
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“You're painfully alive in a drugged and dying culture.”
― Richard Yates, Revolutionary Road
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