Hi - I thought it would be nice to have a thread where people can link to nice cave videos or articles. So I'm going to start...
Phantom Springs Cave Expedition 2013 on Vimeo
These guys have gone to a depth of 462ft/140.8m in Phantom Springs cave, Texas making it the deepest natural underwater cave system in the United States! It's a closed site and only those with scientific permits are permitted to dive but the footage is still nice to look at.