Last of the Great Unknown (2012)
0h 22m | PG-13
The story of Grand Canyon's hidden slot canyons, the canyoneers who systematically explored their drainages, and the secrets hidden deep within their walls.
Director: Dan Ransom
Studio: N/A
Genre: Documentary
Video: 720p
Cast
Bill Formanek
as Self
Todd Martin
as Self
Dave Nally
as Self
Rich Rudow
as Self
Guy Smith
as Self