Last of the Great Unknown

Name: Last of the Great Unknown
Director: Dan Ransom
Genre: Documentary
Released: 2012-04-26
Duration: 22 min
Rating: 8
Cast: Bill Formanek, Todd Martin, Dave Nally, Rich Rudow, Guy Smith

8.0(1)201222mEN

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Directed by Dan Ransom

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