In the early morning hours of 26 March, explorer/Oscar-winning filmmaker James Cameron realized a decade-old dream. He piloted his manned submersible, the Deepsea Challenger , to the deepest place in the World Ocean, the Challenger Deep in the western Pacific’s Mariana Trench. Cameron’s maximum depth was 35,756 feet, only 84 feet less than the Navy’s bathyscaph Trieste 52 years earlier.