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James Cameron dive launches race to the bottom of the world (+video)

Before James Cameron made a solo dive to the Challenger Deep – the deepest point in the ocean – only one mission had been there before. Now, several groups are planning deep-sea dives, and engineering advances could shed new light on the region. 

National Geographic Explorer-in-Residence James Cameron completed a record-breaking dive to the lowest point of the Mariana Trench. See scenes as Cameron's sub, DEEPSEA CHALLENGER, resurfaced, and Cameron emerged from the pilot's capsule around noon, local time (10 p.m. ET March 25th).
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Film director and explorer James Cameron on Monday completed a historic solo dive to the Challenger Deep – the deepest spot in the ocean – aboard an oversized torpedo of a submersible that expedition scientists say could help open new opportunities for researchers to study some of the most remote places on the planet.

The pioneering design of Mr. Cameron's Deepsea Challenger, as well as those of other groups who plan similar manned deep-sea dives later this year, may lead to a new generation of manned and unmanned subs that could accelerate the pace of research generally, other specialists say.

Cameron returned to the surface at noon local time some 300 miles southwest of Guam after enduring nearly seven hours tucked in a cramped cockpit so small he could not fully extend his legs. He spent nearly three hours at the Challenger Deep itself, gathering 3-D video.

He also had planned to gather samples of rocks and marine life. But a hydraulic leak rendered the sub's mechanical arm and claw useless, he explained during a post-dive press briefing.

With no way to gather samples, a planned six-hour stay on the bottom was cut in half.

It took him just over 2-1/2 hours to reach the Challenger Deep and a mere 70 minutes to reach the surface once his time on the bottom ended.

While there, he says he took a page from astronauts' experiences and made sure he took time to savor the view – the otherwise deep, black water illumined by banks of LED lights along the sub's hull.

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