Imagine the first atomic bomb appearing in Nazi Germany. At the beginning of World War II, Germany was far ahead of its Allied partners in nuclear research: the Uranium Club was created two years before the Manhattan Project.
Fear of the German nuclear program was so great that some people expected an atomic bombardment of London already by the end of 1943. That’s why the struggle against it was carried out along different lines and by different people.
Irène Joliot-Curie hid radium from the Germans who had occupied France (just like her mother Marie did in World War I).
A German journal editor pulled information from physicists and engineers and passed it to the West.
Britain sent special forces teams to blow up a heavy water plant in occupied Norway. The brother of the future U.S. president Kennedy trained to pilot an airplane loaded with explosives; using primitive electronics, it was intended to bring it down on the "V-2" missile bunkers, which, it was believed, could carry atomic warheads. And after the Allies landed on the continent, former White Guardsman, a baseball player, and a friend of the head physicist of the Uranium Club went on a real hunt for German scientists.