Add Yahoo as a preferred source to see more of our stories on Google. L. David Marquet is a former United States Navy Captain and author who served in the submarine force for nearly three decades.

Unlike your car, a submarine cannot use GPS to reach its destination, as the technology doesn't work underwater. Here's how ...

While diesel engines don't need spark plugs, they do need air ventilation for proper combustion. This is a problem for vessels traveling underwater, such as submarines. Yet diesel submarines exist and ...

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 ...