China's manned deep-sea submersible, Jiaolong, begins its first dive to go down 7,000 meters into the Mariana Trench, June 15, 2012. [photo:stdaily]
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China's manned deep-sea submersible, Jiaolong, begins its first dive to go down 7,000 meters into the Mariana Trench, June 15, 2012. [photo:stdaily]
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