Director Cameron to explore ocean abyss This February 2012 photo, provided by National Geographic, shows explorer and filmmaker James Came...

Director Cameron to explore ocean abyss

This February 2012 photo, provided by National Geographic, shows explorer and filmmaker James Cameron emerging from the hatch of DEEPSEA CHALLENGER during testing of the submersible in Jervis Bay, south of Sydney, Australia. Earth's lost frontier, the deepest part of the oceans where the pressure is like three SUVs sitting on your little toe, is about to be explored first-hand. It's been more than half a century since man dared to plunge that deep. (AP Photo/Mark Thiessen, National Geographic)

This February 2012 handout photo provided by National Geographic shows the DEEPSEA CHALLENGER submersible beginning its first test dive off the coast of Papua New Guinea. Earth's lost frontier, the deepest part of the oceans where the pressure is like three SUVs sitting on your little toe, is about to be explored first-hand. It's been more than half a century since man dared to plunge that deep. Earth's lost frontier is about to be explored firsthand after more than half a century. (AP Photo/Mark Thiessen, National Geographic)

This handout photo, taken in 2009 by the unmanned submersible Nereus, provided by the Woods Hole Oceanographic Institution, shows the flat bottom of the Mariana Trench that took pictures and samples. This image of a stalked anemone on rocks on the edge, but not quite on the bottom of the deepest place on Earth, where director/explorer James Cameron will be diving soon in a one-man sub. Earth's lost frontier is about to be explored firsthand after more than half a century. (AP Photo/Tim Shank, Woods Hole Oceanographic Institution)

This undated handout photo provided by NOAA shows a deep-chimaera, a boneless fish that is a distant evolutionary relative to modern day sharks taken by an unmanned submersible on NOAA’s Okeanos Explorer in a 2010 in deep water off of Indonesia. These are the type of fish that are seen at great depths in the world’s oceans and might be the type director/explorer James Cameron could see on the way to the deepest spot on Earth, the Mariana Trench. But these type of fish won’t be on the bottom, nearly 7 miles down, because scientists say no traditional fish can survive at depths much past 5 miles. Cameron said. (AP Photo/NOAA)

James Cameron, the director of "Titanic," ''Avatar" and "The Abyss," plans to dive nearly seven miles down in the ocean in a one-man lime green submarine that he helped design. The location is the Mariana Trench in the western Pacific.