In this March 7, 2014 photo released the U.S. Department of Energy, specially-trained workers place instruments in an elevator to make unmanned tests inside a nuclear waste dump in Carlsbad, N.M. They are finalizing plans to enter the nation's only underground nuclear waste dump after two separate incidents forced its closure weeks ago, including a leak that exposed more than a dozen workers to low levels of radiation. Officials with the DOE's Waste Isolation Pilot Plant say initial testing shows there's no contamination at an air intake shaft that leads into the mine or at the bottom of the mine's salt shaft. (AP Photo/Department of Energy)
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