Well you've got to see the images of Stephen Alavez http://alvarezphotography.com/ which were in my latest issue Nat Geo.

Check out the Deep Southern Caves and how Alavez photographed it!!  (BTW Manu forget your Pocket Wizards for this job!)

- http://ngm.nationalgeographic.com/video/player#/?titleID=alvarez-surprise-pit&catID=1