Not much more I can add other than was involved in the manhattan project.
RFB
http://www.king5.com/news/investigations/raw-video-tunnel-at-plutonium-uranium-extraction-plant-collapses-in-hanford/438160260
http://www.king5.com/news/local/hanford/hanford-tunnel-plutonium-uranium-extraction-plant-collapse/438116235
http://q13fox.com/2017/05/09/hanford-tunnel-collapse-nuclear-waste/
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