The first several chapters of this book by Richard Rhodes contain a detailed description of Soviet spying on the Manhattan Project. The value of what was provided to the Soviets is well documented. The U.S. only identified and convicted some of the spies. Some escaped detection and others managed to make it to the Soviet Union before they were captured.
The Prologue demonstrates the rich dialogue of the book. “The Hiroshima bomb, Little Boy, was a uranium gun. It used sixty-four kilograms of rare uranium 235, all of that dense, purple-black metal the United States had been able to accumulate up to the end of July 1945.” Luis Alvarz was an American experimental physicist who worked in the Manhattan Project and invented a device for measuring the yield of the Hiroshima burst. The devices were dropped by parachute ahead of the bomb radioed their readings to Alvarez in a backup plane. “Alvarez had seen the bright flash of the Hiroshima explosion, had watched (the) pressure gauges register on the oscilloscopes…(and) felt the two sharp slaps of direct and ground-reflected shock waves slamming the plane like flak explosions…”Alvarez searched for the city below the rising mushroom cloud. “Alvarez could not see the city because the city had been destroyed.” A second atomic bomb exploded over Nagasaki three days later and the Japanese surrendered a few days later with the emperor referring to the “terrible bomb.” Continue reading