A review of high-resolution Airbus Neo satellite images from September 19 to September 29, 2022, provides details on the current observable status of the Punggye-ri Nuclear Test Facility.
While all preparations for a nuclear test appeared completed at Tunnel No. 3, we see new work being done at Tunnel No. 4: 1) significantly, the area directly in front of the portal shows evidence of clearing, and 2) construction of the access road to Tunnel No. 4 continues.
There is no new activity at Tunnel No. 3. This is expected because both the United States and South Korea assess North Korea as having finished all preparations for conducting a nuclear test using this tunnel.