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Spies in the Manhattan Project provided them with detailed plans of both the MK-I uranium gun design and the MK-III plutonium implosion design. However by the time the Soviets had been able to manufacture enough plutonium to build their version of the MK-III, their own scientists had designed a far better higher yield atomic bomb that used less plutonium than the MK-III. However Beria and Stalin insisted that the Soviet nuclear scientists must test the design provided by the spies, not their own better design to prove that the spies had not been providing disinformation about the atomic bomb.

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8y ago

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