As of 5:52 EDT today, James Cameron reached the bottom of the Mariana Trench, the deepest point in the ocean and a depth not reached by any human being since 1960. This expedition comes just a few weeks after Cameron set a solo diving world record in preparation for his dive into the Mariana Trench. Cameron will spend about six hours at the bottom of the ocean, collecting samples as well as video footage with multiple 3D video cameras. This expedition is the culmination of seven years of work by Cameron and his crew to build the Deepsea Challenger, a submersible capable of making the journey. After his time 35,756 feet underwater, the Deepsea Challenger will drop its weights and head back to two research ships on the surface. National Geographic has been covering this voyage closely, so keep your eyes on its site for more details on what Cameron finds in the depths.