Last of the Great Unknown
2012
Movie
22 min
⭐ 8.0
Documentary
Overview
The story of Grand Canyon's hidden slot canyons, the canyoneers who systematically explored their drainages, and the secrets hidden deep within their walls.
Where to Watch
Available on:
Cast
Bill Formanek
Self
Todd Martin
Self
Dave Nally
Self
Rich Rudow
Self
Guy Smith
Self
