A worker walks past the front cutting section of an enormous tunnel boring machine (TBM), named "Lady Bird" on display at the Blue Plains Advanced Wastewater Treatment Plant before it is lowered 100 feet underground to begin a tunneling project under the Anacostia River, Washington, D.C., Tuesday, April 9, 2013. The tunneling is a major part of the D.C. Water's Clean Rivers Project to significantly reduce combined sewer overflows in the District for improved water quality. (Andrew Harnik/The Washington Times)
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