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 ...

Visiting historic submarines requires a certain level of comfort with confined spaces, steep ladders, and the smell of diesel fuel. I can't recommend it highly enough. There are 15 World War II-era ...