This February 2012 handout photo provided by National Geographic shows the DEEPSEA CHALLENGER submersible beginning its first test dive off the coast of Papua New Guinea. Earth's lost frontier, the deepest part of the oceans where the pressure is like three SUVs sitting on your little toe, is about to be explored first-hand. It's been more than half a century since man dared to plunge that deep. Earth's lost frontier is about to be explored firsthand after more than half a century.  (AP Photo/Mark Thiessen, National Geographic)
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