[Dion]

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.

http://www.dailymail.co.uk/sciencete...aft-China.html