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 35, 756 feet down 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