Cavechat.org

Well, it's probably more expensive than a frog system but it requires a lot less leg energy! This post is from NBC News.
http://www.nbcnews.com/news/weird-news/ ... ve-n214101
PS: I'm glad he went into an "underground cave" and not an above ground cave.

There was (still is?) a commercial cave in Missouri that advertised the world's highest underground balloon ascent. Does this take the record away?

Wow! That'd be a pretty cool way to see a deep pit like that. I can imagine that working well in someplace like Golindrinas.

Trogman