NORTH KOREA AT IT AGAIN GOING FOR ITS POSSIBLE 4TH NUCLEAR TEST AS A NEW TUNNEL BEING EXCAVATED IN PREPARATION "H" FOR THE UNDER GROUND DETONATION

North Korea is believed to be excavating a new tunnel at its nuclear test site located in Punggye-ri, according to a U.S. research center that specializes in North Korea affairs, Wednesday.

The conclusions reached by the center's analysis have prompted speculation that Pyongyang is preparing for a forth nuclear test.
Citing satellite imagery taken from October to November, 38 North have said that Pyongyang is excavating a new tunnel in a new area of the site in addition to the three others where the repressive state has either conducted nuclear tests or excavated tunnels in the past.

http://www.koreatimes.co.kr/www/news/nation/2015/12/116_192340.html