This photograph depicts a scene from nuclear testing during the Cold War This footage documents the U.S. nuclear test Operation Dominic in the Pacific Ocean in 1962 The scene in the image may be one of the tests in the operation, such as the “Questa” test, which was an air-dropped nuclear explosion on May 4, 1962 These experiments typically produce enormous mushroom clouds, with some releasing energy equivalent to hundreds of kilotons of TNT

Source: Recently Declassified Dominic Nuclear Explosion Footage 1962