Last of the Great Unknown (2012)
⭐ 8/10 22 min
Documentary
The story of Grand Canyon's hidden slot canyons, the canyoneers who systematically explored their drainages, and the secrets hidden deep within their walls.
Cast
Bill Formanek
Self
Todd Martin
Self
Dave Nally
Self
Rich Rudow
Self
Guy Smith
Self
Directed by: Dan Ransom
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