Explorer and filmmaker James Cameron on Sunday became the first solo explorer to reach the bottom of the 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. Mark Thiessen/National Geographic/AP Buy Photo