On October 30, 1961, the most powerful weapon ever constructed by mankind was exploded over the island of Novaya Zemlya in the Arctic Sea. The device was code-named "Ivan," and it was a multi-stage hydrogen bomb which was built in only fifteen weeks by engineers in the USSR, using off-the-shelf nuclear weapon components.
It was intended as a display of Soviet superiority during a period of grave tension between the USSR and the United States. The Russians had erected the Berlin wall only two months earlier, and they had just ended a shaky, three-year moratorium on atmospheric nuclear weapons testing. Before Ivan, the largest explosion the world had seen was an incredible 15 megatons, an event which caused a mushroom cloud five kilometers across. Ivan's explosion was over three times more powerful, despite the fact that the device was deliberately prevented from operating to its full potential.
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