[Steely Tom]

Counter intuitive but they go through water easier even though the ship just rides on top

Yeah they don't waste energy kicking up all those waves and foam and spray.

[Zuriel]

**Yeah they don’t waste energy kicking up all those waves and foam and spray**

Well, I don’t know much about watercraft in general, but a propeller on either is pushing against a liquid. Neither is putting tires to asphalt. The sub doesn’t have to deal much with headwinds or crosswinds, so I assume that helps efficiency.