[해외자료] North Korea’s Next Nuclear Test: How Big Could It Be?
...excavate a new portal (entrance) approximately 50 meters east of the original (now demolished) South Portal, there is wide speculation that North Korea could conduct a nuclear test soon. Based on the
terrain, geology, topography, and suspected tunnel schematics, the two drifts at this southern tunnel complex are estimated to be capable of containing explosions around 50 to 120 kilotons, respectively.