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Punggye-ri Update: Continued Activity Near Tunnel No. 4

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.

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