Diesel engines need oxygen, so how do submarines use them underwater?

Diesel engines cannot work without oxygen, so how do diesel submarines operate when they're underwater? Their propulsion ...
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Diesel engines need air, submarines run underwater, so how do diesel submarines work?

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 ...

I toured the USS Lionfish, a Balao-class submarine that rescued downed pilots in World War II. Take a look inside.

The USS Lionfish was commissioned in 1944 and earned one battle star for service in World War II. It sank a Japanese submarine, rescued the crew of a B-29 bomber, and served as a training submarine.
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I toured the USS Cobia, a World War II submarine that sank 13 ships and received 4 battle stars. Take a look inside.

Add Yahoo as a preferred source to see more of our stories on Google. I toured the USS Cobia, a World War II submarine that sank 13 ships and received 4 battle stars. Take a look inside. The USS Cobia ...