The bathyscaphe Trieste is pictured above. It is the first and last manned submersible to visit the Challenger Deep. James Cameron will most likely change that very, very soon.
Click the link to a phenomenal article by National Geographic about James Cameron's upcoming dive to the Challenger Deep. The article has links to a few excellent videos and animations as well. Exceptionally well done, so it's worth checking out.
National Geographic - James Cameron's Dive
