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In this Thursday, May 24, 2018 photo, The fourth tunnel of North Korea's nuclear test site is blown up in Punggye-ri, North Korea. North Korean leader Kim Jong Un made good on his promise to demolish his country's nuclear test site, which was formally closed in a series of huge explosions Thursday as a group of foreign journalists looked on. (Korea Pool/Yonhap via AP)
In this Thursday, May 24, 2018 photo, The fourth tunnel of North Korea's nuclear test site is blown up in Punggye-ri, North Korea. North Korean leader Kim Jong Un made good on his promise to demolish his country's nuclear test site, which was formally closed in a series of huge explosions Thursday as a group of foreign journalists looked on. (Korea Pool/Yonhap via AP)

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    See North Korea's nuclear tunnels go up in smoke

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See North Korea's nuclear tunnels go up in smoke

North Korea appeared to destroy at least three nuclear tunnels and several buildings at its Punggye-ri nuclear test site on May 24.

See North Korea's nuclear tunnels go up in smoke

North Korea appeared to destroy at least three nuclear tunnels and several buildings at its Punggye-ri nuclear test site on May 24.