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Watch National Geographic Inside the Nuclear Threat online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

What could we do if we had evidence terrorists were close to acquiring nuclear weapons, or even making their own? How would we defend ourselves from a blast with fireballs hotter than the sun? Race from motorcade to helicopter to confidential meeting, as scientists and intelligence experts brief viewers on the hard facts about the world's most lethal weapons - and the unbreakable physical laws that govern them.