North Korea: Latest satellite imagery data shows that North Korea is digging a new test tunnel at its nuclear proving site in Punggye-ri. The pictures show fresh signs of excavation and a canopy over the tunnel’s entrance. The new activity is believed to have started at a test tunnel in May 2013. It is not clear whether the work is for maintenance or for some other purpose. The news was first reported by 38 North group, which is run by the US-Korea Institute at Johns Hopkins School of Advanced International Studies and headed by a former US State Department official. The new tunnel, providing access to Mount Musan, is in a different area from the three existing sites. Excavation work has caused erosion, leaving the surface of the mountain cracked and weak, 38 North says.