The National Journal discussed Joel Wit’s talk on Tuesday at the American Security Project, during which he spoke about digging seen in satellite photographs around North Korea’s Punggye-ri test site. Joel Wit, a former State Department satellite imagery analyst, edits the 38 North website, which records developments within North Korea.

Speaking on Tuesday to an audience at the American Security Project, Wit said another underground test is not likely in the short term but the preparations appear to indicate Kim Jong Un’s regime is keeping its future options open.

The activities are open to interpretation. North Korea could be launching construction of a new tunnel, completing a tunnel already under way, repairing damage to an existing tunnel or clearing debris from older underground chambers, he said.

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Event summaries on the imagery analysis and Mr. Wit’s policy observations can be found on the American Security Project website.