Design:Bill Stone Explores the World's Deepest Caves
In the last 150 years since Jules Verne had great science-fiction concepts of what the underworld was like， technology has enabled us to go to the places that were previously completely unknown and speculated about. We can now descend thousands of meters into the Earth with relative impunity. Along the way we've discovered fantastic abysses and chambers so large that you can see for hundreds of meters without a break in the line of sight.
- Added：2010
- Country：USA
- Duration：20
- Time of update：2011/9/21 8:59:38