BBC created Planet Earth series a few years ago.
The trailer can be seen here - 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.
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"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".