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The discovery of uranium fission in Nazi Germany in 1938 terrified Allied nuclear scientists\u2014especially since the Nazi atomic bomb project, the dreaded Uranium Club, had a two-year head start on the Manhattan Project.

So the Allies decided to strike back. They couldn\u2019t prevent Germany from acquiring uranium, but they could disrupt access to another key ingredient in atomic research\u2014heavy water. Only one company in the world produced heavy water at the time, an isolated plant in Norway, so the Allies decided to send in teams of elite commandos on a top-secret mission to destroy it.

These missions certainly didn\u2019t go perfectly\u2014some were in fact disasters. But to prevent Hitler from getting an atomic bomb, no price was too high to pay.

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