1. 25-megaton hydrogen bomb
> Lethality index score: 210,000,000,000
Created in the manic arms race of the Cold War, the B-41 hydrogen bomb is the deadliest weapon on this list. The bomb has never been used in warfare but is capable of destruction on a colossal scale. Its 25-megaton payload is equivalent to 25 million tons of TNT and significantly more powerful than Fat Man’s 20 kilotons of destructive power. The bomb entered US military service in 1961 and was retired in 1976.
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