Last of the Great Unknown
Watch Last of the Great Unknown
Type: Movie Category: DocumentaryYear: 2012Details
The story of Grand Canyon's hidden slot canyons, the canyoneers who systematically explored their drainages, and the secrets hidden deep within their walls.
- Genres: Documentary
- Language: English
Cast & Crew
- Cast:Bill Formanek , Todd Martin , Dave Nally , Rich Rudow , Guy Smith
- Director: Dan Ransom
