Construction workers assist in the assembly of a gigantic steel-arch to cover the remnants of the exploded reactor at the Chernobyl nuclear power plant in Chernobyl, Ukraine, Tuesday, Nov. 27, 2012. The new safe confinement, a structure that is being built over reactor 4 damaged in 1986 as a result of the world’s worst nuclear accident, will cover a hastily built sarcophagus, which was erected shortly after the explosion. (AP Photo/ Efrem Lukatsky)
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