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Nuclear submarines can go for years without the need to refuel their reactors. Diesel Electric submarines only use their Diesels for battery recharging - their primary mode of propulsion is an electric motor. As such, DE's have considerable range and don't have to refuel often since they don't use their diesels that often.

During WWII, diesel engines were the primary mode of propulsion, since submarines of that era were essentially surface ships with submergence capability. But they normally transited on the surface. Today's DE's transit and travel underwater unless they're entering port, and battery technology has extended the average recharge time from a couple of days to weeks.

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