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"  On March 25, James Cameron became the third person\u2014and the only one traveling solo\u2014to visit Challenger Deep, 6.8 miles below the western Pacific Ocean&amp;#039;s surface. With the help of the Australia-based Acheron Project, the director engineered the Deepsea Challenger, a one-of-a-kind vertical-descent submersible equipped with HD 3D cameras [1], tools to gather scientific samples [2], and specially designed batteries housed in plastic cases filled with silicon oil [3]. Instead of building the sub out of steel and using foam to make it neutrally buoyant, Acheron created a new syntactic foam\u2014epoxy resin containing hollow glass microspheres\u2014that serves as the main structural material [4]. Cameron sat in a 2.5-inch-thick, 43-inch-diameter steel sphere [5], where he controlled the sub with joysticks. Deepsea Challenger reached the bottom in 2.5 hours with the help of 1000-plus pounds of steel weights [6]. Cameron had to resurface after 3 hours on the seafloor because of a hydraulic leak\u2014he flipped a switch to jettison the weights and ascended in 70 minutes\u2014but by and large, the sub performed as planned. &amp;quot;Yeah, your life is at risk any time you go into a hostile environment like that,&amp;quot; he told Popular Mechanic last fall. &amp;quot;But you trust the engineering.&amp;quot; "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.popularmechanics.com/science/environment/a7863/james-camerons-deep-ocean-dive-diagrammed-9479167/>