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Footage of Nuclear-Weapons Tests Declassified

After decades spent slowly disintegrating in high-security vaults, thousands of historic films of U.S. nuclear weapons tests have been salvaged, including some that have been newly declassified. The incredible footage shows enormous mushroom clouds ballooning over the horizon in what could be a doomsday flick.

A mushroom cloud forms after a nuclear weapons test dubbed Operation Hardtack-1 - Nutmeg in May 1958 on Bikini Atoll in the Pacific Ocean.