Divesitevideos.com produced a really nice video of cave diving in Mexico. The images were shot last May. <a href="http://video.google.com/videoplay?docid=-7099692863668916315&q=cave">Click here to watch the video</a>.
There are couple more videos from the same trip on their site:
http://www.divesitevideos.com/EJPP/May%202005/index.htm