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[cnn.com...]
Named for its supposed resemblance to a crouching hyena, the Hyanide is designed to run on a flexible rubber tread that spans the machine's entire underside. So if any part of the bottom is touching the ground, the Hyanide should be able to move, no matter how deep the quagmire, no matter how rough the terrain.- Popular Science
This does look a lot more maneuverable than a sled; I want to see it live in 4-feet of powder or mud. It would at least make a cool video game.