This particular "journey" may not involve any humans descending into the Earth, but that doesn't mean it isn't still plenty ambitious -- a pair of scientists are now proposing to drill to the Earth's mantle and bring back some samples, effectively picking up where the first attempt to do so left off some fifty years ago. Of course, the key word here is "proposing," but the scientists, Damon Teagle and Benoît Ildefonse, say that we now have the technology and knowledge necessary to do so, and that drilling could begin by 2020 if everything goes as planned. They're looking to get things underway well before that, however, and are already planning an expedition in the Pacific as soon as next month where they say they will "bore further into the oceanic crust than ever before."

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Scientists propose a 'journey to the mantle of the Earth'