Last of the Great Unknown

2012 • Directed by

Dan Ransom

Documentary

The story of Grand Canyon's hidden slot canyons, the canyoneers who systematically explored their drainages, and the secrets hidden deep within their walls.

Release Date

4/26/2012

Rating

8.0/10

Cast

Bill Formanek

Self

Todd Martin

Self

Dave Nally

Self

Rich Rudow

Self

Guy Smith

Self

Crew

Dan Ransom

Director

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