In the BBC Planet Earth trailer - where is the sky diver jumping?

Question

BBC created Planet Earth series a few years ago.

The trailer can be seen here: http://www.bbc.co.uk/nature/collections/p00fxg1n - if you go to 0.25 (screenshot below) it shows a sky diver jumping into a forest hole - I wanted to know where that is filmed.

Answer 1

"Cave of Swallows" - This can be seen here: at about 1:05

From the youtube description: This 400 meters deep cave is located in a rainforest in San Luis Potosí. This Video is a beginning of BBC´s 2006 "Planet Earth".