Diesel engines cannot work without oxygen, so how do diesel submarines operate when they're underwater? Their propulsion system accounts for this limitation.

Diesel-powered submarines present a seemingly paradoxical challenge: diesel engines require oxygen to operate, while submarines spend most of their time underwater.

Americans may not be too fond of diesel engines, but that doesn't mean they're any less vital for the economy than their gasoline-fueled counterparts. For example, in 2022, the U.S. transportation ...