"Commercial satellite imagery of North Korea’s Punggye-ri Nuclear Test Site from mid-March 2018 suggests that there has been a significant slowdown in tunneling and a reduced presence of related personnel at the site when compared to just two weeks earlier. During this same time period, high-level talks between North and South Korea moved forward, including Pyongyang’s proposal for a summit with US President Donald Trump."

newsgw.com/north-koreas-punggye-ri-nuclear-test-site-significant-slowdown-in-tunneling/