This is something I've always wanted to do--I love caves. But, I'm so claustrophobic that I got a bit breathless just reading your description. So, I'd never be able to do it.

I will just live vicariously through you. We have some pretty cool wild cave tours in Texas too. Want to rappel down into a cave? http://www.cavernsofsonora.com/index.php?link=specialtytours

I think that Sonora is one of only 2 caves I haven't explored in Texas--at least opened to visitors.