Good story on caving in Oman that some of you guys might be interested in. Here is a link, but if you can get a hard copy of National Geographic then there are some pretty good photos to take a look at.
Only problem is that they are trying to open it up to tourism! I guess Nat Geo does that anyway with such a huge readership.
http://magma.nationalgeographic.com/ngm/0304/feature2/index.html