Last of the Great Unknown

Documentary4.0

The story of Grand Canyon's hidden slot canyons, the canyoneers who systematically explored their drainages, and the secrets hidden deep within their walls.The story of Grand Canyon's hidden slot canyons, the canyoneers who systematically explored their drainages, and the secrets hidden deep within their walls.

April 26, 2012 · 22m · Directed by Dan Ransom

Rating distribution: 1 ratings

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