Last of the Great Unknown
Last of the Great Unknown
Last of the Great Unknown no Megacine. The story of Grand Canyon's hidden slot canyons, the canyoneers who systematically explored their drainages, and the secrets hidden deep within their walls.
- Gênero: Documentário
- País: United States
- Diretor: Dan Ransom
- Atores: Bill Formanek, Todd Martin, Dave Nally, Rich Rudow, Guy Smith,
