Last of the Great Unknown (2012)
- HD 1080
- Runtime: 22m.
- Status: Released
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- Languages: en
- Country: United States of America
- Director: Dan Ransom
- Stars: Bill Formanek, Todd Martin, Dave Nally, Rich Rudow, Guy Smith
- keywords: sports, grand canyon
- The Last of the Great Unknown is featured in the top rankings of 2012
- #23 in Top Documentary Movies of 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.
