Diesel-powered submarines present a challenge that may seem paradoxical at first. Their engines require oxygen to operate, yet these vessels routinely travel beneath the ocean surface. Naval engineers ...

Inside a diesel engine's cylinder, compressed air raises the temperature to ignite injected fuel, and the resulting force drives pistons to power the vehicle's main gears. Chief to this combustion ...

China has rapidly built up its submarine fleet by making a technological U-turn to produce boats the U.S. hasn’t built in more than 65 years. More than half of the estimated 66 submarines operated by ...