Cameron Mariana Trench

Filmmaker and National Geographic Explorer in Residence James Cameron is congratulated by ocean explorer and U.S. Navy Capt. Don Walsh, right, after completing the first ever solo dive to the Challenger Deep, the lowest part of the Mariana Trench. Walsh took the same journey to the bottom of the Mariana Trench 52 years ago in the bathyscaphe Trieste with Swiss oceanographer Jacques Piccard. Cameron's dive in his specially designed submersible was part of Deepsea Challenge, a joint scientific expedition by Cameron, the National Geographic Society and Rolex to conduct deep ocean research. (AP Photo/Mark Theissen, National Geographic)

In a photo provided by National Geographic filmmaker and National Geographic Explorer in Residence James Cameron holds the National Geographic Society flag after he successfully completed the first ever solo dive to the Mariana Trench Monday March 26, 2012. The dive was part of Deepsea Challenge, a joint scientific expedition by Cameron, the National Geographic Society and Rolex to conduct deep ocean research. (AP Photo/Mark Theissen, National Geographic)

Filmmaker and National Geographic Explorer in Residence James Cameron emerges from the Deepsea Challenger submersible after his successful solo dive to the Mariana Trench, the deepest part of the ocean, Monday March 26, 2011. The dive was part of Deepsea Challenge, a joint scientific expedition by Cameron, the National Geographic Society and Rolex to conduct deep ocean research. (AP Photo/Mark Theissen, National Geographic)

In an image provided by National Geographic filmmaker James Cameron gives two thumbs up as he emerges from the Deepsea Challenger submersible Monday March 26, 2012 after his successful solo dive in the Mariana Trench, the deepest part of the ocean. The dive was part of Deepsea Challenge, a joint scientific expedition by Cameron, the National Geographic Society and Rolex to conduct deep ocean research. (AP Photo/Mark Theissen, National Geographic)

In this photo provided by National Geographic, the DEEPSEA CHALLENGER submersible carrying filmmaker and National Geographic Explorer in Residence James Cameron is hoisted into the Pacific Ocean on its way to the Challenger Deep, the deepest part of the Mariana Trench, Sunday, March 25, 2012. The dive was part of DEEPSEA CHALLENGE, a joint scientific expedition by Cameron, the National Geographic Society and Rolex to conduct deep ocean research. (AP Photo/National Geographic, Mark Thiessen)

In this photo provided by National Geographic, filmmaker and National Geographic Explorer in Residence James Cameron gets a handshake from ocean explorer and U.S. Navy Capt. Don Walsh, right, just before the hatch on the DEEPSEA CHALLENGER submersible is closed and the voyage to the deepest part of the ocean begins, Sunday, March 25, 2012. Walsh took the same journey to the bottom of the Mariana Trench 52 years ago in the bathyscaphe Trieste with Swiss oceanographer Jacques Piccard. Cameron is the first person to complete the dive solo. The dive was part of DEEPSEA CHALLENGE, a joint scientific expedition by Cameron, the National Geographic Society and Rolex to conduct deep ocean research. (AP Photo/National Geographic, Mark Thiessen)

In this photo provided by National Geographic, filmmaker and National Geographic Explorer in Residence James Cameron slides into the hatch of the DEEPSEA CHALLENGER submersible as he prepares for his record dive to the bottom of the Mariana Trench, Sunday, March 25, 2012. The dive was part of DEEPSEA CHALLENGE, a joint scientific expedition by Cameron, the National Geographic Society and Rolex to conduct deep ocean research. (AP Photo/National Geographic, Mark Thiessen)

This February 2012 file 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. Cameron on Sunday, March 25, 2012 began his journey to someplace only two men have gone before to the Earth's deepest point. The director of Titanic, ''Avatar and other films is using the specially designed submarine to descend nearly seven miles (11 kilometers) to the bottom of the Mariana Trench, an area 200 miles (320 kilometers) southwest of the Pacific island of Guam. (AP Photo/National Geographic, Mark Thiessen, File)