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 walls.

Genre:

Documentary

Duration:

22 min

Actor:

Bill Formanek, Todd Martin, Dave Nally

Quality:

HD

Director:

Dan Ransom

Release:

2012

Country:

United States of America

IMDb:

8.0