A new route on Roraima in remote Guyana by Greg Child, Jared Ogden, and Mark Synnot went partly under a waterfall. The approach involved hiking 40 to 50 miles through jungle.
http://www.climbing.com/news/hotflashes/cuttingtheline/
http://members.shaw.ca/beyondnootka/art ... raima.html
http://www.alpinist.com/doc/ALP04/climb ... epui-ogden (a previous climb)