On Friday, the analysts Joseph S. Bermudez Jr. and Jack Liu posted new
satellite images of the nuclear test site in Punggye-ri, in northeastern North Korea, on 38 North, a website affiliated with the Johns Hopkins University School of Advanced International Studies.
From the commercial imagery dating from Wednesday,
they noted what looked like trailers near the portal of a tunnel where they said North Korea appeared to have been preparing for a nuclear test, which would be its sixth. They also noted mining carts along the tracks leading to a spoil pile and a net canopy, presumably concealing equipment.
The North Koreans appeared to have stopped pumping water out of the tunnel. In an earlier report, the analysts said this might mean that the tunnel had been sealed for a possible test.