North Korea claims it’s destroyed its only nuclear test site. Punggye-ri is an underground facility within Mount Mantap. It has a tunnel network with multiple entrances. But what exactly did North Korea say it blew up? Let’s take a closer look. It destroyed the entrances to three tunnels: The north entrance. The west entrance. The south entrance. And administrative and housing buildings. It’s unclear if these explosions would prevent the site from being used again. No independent nuclear monitors were present. The North Korean government did invite a select group of foreign journalists to watch. But authorities strictly controlled their trip. The testing site borders a massive prison camp, where it’s estimated that thousands of political prisoners are in captivity. The country has held six nuclear tests in Punggye-ri in the past 12 years.