Seven years later he almost drowned while failing to jump the Snake River Canyon, a quarter-of-a-mile wide, in Idaho.

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In 1974, Evel Knievel tried to jump over the Snake River canyon in a steam-powered rocket.

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I'll meet those who depend on this natural world wonder and the mighty Zambezi river that feeds it, as I attempt to bungee jump for the first time!

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"Jump out now, " Ashley urged, as the raft maneuvered effortlessly through the roiling river.

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