Hydrogen bomb tests continued, and in 1954, the US detonated its largest bomb — Castle Bravo — a 15 megaton blast over Bikini atoll. The explosion was over 1,000 times more powerful than the ...

The first thermonuclear bomb test (hydrogen bomb), Ivy Mike, was conducted by the United States in 1952.The Soviet Union tested the Tsar Bomba in 1961, which was the most powerful bomb ever detonated.