Explosion of the first hydrogen bomb, during a test on Eniwetok Atoll in the Marshall Islands, as part of Operation Ivy Mike on November 1, 1952. Sometimes called the “Super” bomb at the time, this was to be the first full-blown test of what was to become known as the Teller-Ulam design for a fusion device. Edward Teller pressed for the first hydrogen bomb test, which was conducted just days before a presidential election.