Storyline
Why is a small region of China home to an extraordinary number of giant holes containing vast, little explored subterranean forests? One professor is on a dangerous mission to find out.
Released
1/1/2012
Runtime
45min
Genre
Status
Released
Language
English
Production
National Geographic
Cast
More like this
The Class of ‘92
7.1
We Live in Public
6.9
Deepsea Challenge 3D
6.6
The Curious Birth of Benjamin Button
7
Transcendent Man
6.7
My Mom Jayne
8
Naqoyqatsi
6.1
The Weather Underground
6.7
Charlie: The Life and Art of Charles Chaplin
6.9
Directed by John Ford
6.9
The Assassination of Jesse James: Death of an Outlaw
6.7
In the Realms of the Unreal
7.2
A Plastic Ocean
7.5
Above Majestic
7.4
The Mole: Undercover in North Korea
7.1
Boys State
7.1
Capital in the Twenty-First Century
6.5
The Water Man
6.1
Powaqqatsi
7.3
Ex Libris: The New York Public Library
6.4