On November 1, 1952 a 10.4 megaton thermonuclear explosion, code-named MIKE, at Eniwetok Atoll demonstrated the release of energy from nuclear fusion. The apparatus was an experimental device, not a weapon, that had been constructed on the basis of the principles developed by Edward Teller and Stanislaw Ulam. The island of Elugelab in the Eniwetok Atoll on which the test was conducted, was completely vaporized.

See Hydrogen Bomb.