The "Deepsea Challenge" expedition is being chronicled for a 3D feature film on the intensive technological and scientific efforts behind Cameron's dive.
Cameron and the Deepsea Challenge submersible are seen here being lowered into the Pacific Ocean at the start of his expedition on March 24.
March 26, 2012 12:32 AM PDT
Photo by: Mark Thiessen/National Geographic
| Caption by: James Martin
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