Last of the Great Unknown

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

Starring: Todd Martin, Bill Formanek, Dave Nally, Rich Rudow
Genre: Short, Sport
Countries: United States
Release Date: April 26, 2012
Runtime: 22 min
IMDb Rating: Last of the Great Unknown (2012) on IMDb


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