[fodrv7]

I looked up S?tano de las Golondrinas (The Cave of Swallows) on the internet http://aerialextreme.com/cb/main.html , after seeing it in the opening of David Attenborough's 'Planet Earth'.

I thought the 'aviators' leaping into this hole mentally ill, until I saw the size of it.
Notice that it overhangs on all sides.
Click on 'Cave Schematic'.

Mind blowing.

Pete

 

[szicree]

Holy crappety-****!!! Get the IMAX crew down there right now! That is amazing.

 

[Bryan Wood]

Wow

Not wanting to be a follower I'm very thankful that others have already tried this so that I don't have to do it.