North Korea appears to be expanding restoration work at its nuclear test site to include a second tunnel, a U.S.-based think tank said on Thursday, as South Korean and U.S. officials say a new nuclear test could happen any day.
Work and preparations at Tunnel No. 3 at the Punggye-ri Nuclear Test Facility are apparently now complete and ready for a possible nuclear test, the Center for Strategic and International Studies said in a report, citing commercial satellite imagery.
