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This April 1, 2012 satellite image provided by DigitalGlobe shows the area of the nuclear test site near Punggue-ri, North Korea. South Korean officials have found evidence of the excavation of a new tunnel at the site, where nuclear tests were conducted in 2006 and 2009, in what appears to be preparation for a third nuclear test. The excavation is in its final stages, according to a report by intelligence officials that was shared with The Associated Press on Monday, April 9, 2012. (AP Photo/DigitalGlobe) MANDATORY CREDIT