With a storeable dc power source, just like a car or truck. I suppose if that failed or had somehow discharged incorrectly, there should probably be a way to h

With a storeable dc power source, just like a car or truck. I suppose if that failed or had somehow discharged incorrectly, there should probably be a way to handcrank the diesel generator, like how early cars required hand cranking to start. PS: I had to look it up, but that's an interesting reason why that us sub had 2 nuclear reactors.