Cameron, others plan to explore the Mariana Trench

** FILE ** In this March 18, 2012, file photos, an unmanned submersible took a photo of the flat bottom of the trench with a stalked anemone within view. (National Geographic via Associated Press)

** FILE ** In this March 18, 2012, file photos, an unmanned submersible took a photo of the flat bottom of the trench with a stalked anemone within view. (National Geographic via Associated Press)

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