While submerged, submarines can travel faster than when they are on the surface. As water is more viscous and dense than air, causing more friction, how can it travel faster while travelling through a denser medium.
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I think all of these answers swim around a critical point. The surface of water may not be flat. If you follow a wave you have to go further on the surface of a wave then if you go straight through. Think of an underwater submarine as tunneling through space while a submarine on the surface has to follow the surface and change position vertical as well as horizontal.
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