Posted February. 21, 2011 10:36,
North Korea has reportedly drilled several underground tunnels at it nuclear test site in the village of Punggye-ri, North Hamgyong Province, apparently for its third nuclear test.
A South Korean government source said Sunday that the North has dug at least three tunnels in Punggye-ri since last winter and that the sites are under close surveillance by South Korean and U.S. intelligence. Pyongyang conducted nuclear tests in Punggye-ri in October 2006 and May 2009.
According to intelligence, the depth of the L-shaped underground tunnels is estimated at 500 meters to 1 kilometer, and North Korea excavated tunnels simultaneously to select the best location and depth.
Another source said the North has been preparing for another nuclear test in Punggye-ri since last winter and irritated the U.S. by intentionally showing busy activity on clear days so that U.S. reconnaissance satellites would capture the scene.