Hold on to your specs while peering down here. You'd have a long climb to the bottom if they fell off.
This rocky chasm in China is one of the world's deepest underground shafts. It stretches down for an astonishing 3,100ft, or 1,026 metres.
An international team of cave explorers who discovered the cave, near the village of Tian Xing, are seen descending into the abyss.
Camping underground for four to five days at a time, the team were able to explore the extensive network of caves and tunnels.
Though unimaginably deep, the Chinese caves are actually dwarfed by others across the globe.
The world's deepest cave is Krubera in Georgia, which is 6,822ft deep (2,080 metres), followed by Lamprechtsofen in Austria (5,354ft or 1,631 metres) and Gouffre Mirolda in France (5,335ft or 1,626 metres).
As an interesting comparison, the world's tallest peak, Mount Everest, is 29,029ft (8,848 metres) high.
Source: Daily Mail UK., October 30, 2008