Last of the Great Unknown (2012)
The story of Grand Canyon's hidden slot canyons, the canyoneers who systematically explored their drainages, and the secrets hidden deep within their walls.
Released: Apr 26, 2012
Runtime: 22 minutes
Genre: Documentary
Stars: Bill Formanek, Todd Martin, Dave Nally, Rich Rudow, Guy Smith
Crew: Dan Ransom (Director)
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