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A satellite photo of the Punggye-ri nuclear test site in North Korea on Wednesday. Digitalglobe hide caption

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Digitalglobe

North Korea Demolishes Its Nuclear Test Site In A 'Huge Explosion'

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South Korean national security adviser Chung Eui-yong speaks to reporters at the White House Thursday evening. South Korean intelligence chief Suh Hoon is at left. Susan Walsh/AP hide caption

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Susan Walsh/AP

In May 1962, the U.S. conducted its first and only test of a nuclear-tipped missile. Some worry North Korea could try something similar. United States Navy /Science Faction/Getty Images hide caption

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United States Navy /Science Faction/Getty Images

How North Korea's Nuclear Tests Could Get Even More Terrifying

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A still from a film recently digitized by a team at Lawrence Livermore National Laboratory. The film shows a 1958 explosion at Bikini Atoll in the Marshall Islands. Screen grab by NPR/YouTube hide caption

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Screen grab by NPR/YouTube