Watch Last of the Great Unknown
- NR
- 2012
- 23 min
-
7.4 (20)
The story of Grand Canyon's hidden slot canyons, the canyoneers who systematically explored their drainages, and the secrets hidden deep within their walls.
Last of the Great Unknown is a 2012 documentary with a runtime of 23 minutes. It has received mostly positive reviews from critics and viewers, who have given it an IMDb score of 7.4.
