NxtUp...Vehicles
Super-fast Submarine
The Pentagon is developing a super-fast submarine that will travel about four times the current speed limit. "The sub utilizes the phenomenon known as supercavitation. Supercavitation is the process wherein an object moves so fast through the water that it creates a gas bubble around itself, nearly eliminating drag. Unencumbered by the high drag of water, the object is free to speed along at much higher speeds than otherwise possible. Supercavitation has been known since the end of World War Two, and the Soviets succeeded in creating a torpedo that utilizes supercavitation for high-speed travel."
Image from a below Dark Roasted Blend post.
popsci.com
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