Race for the Superbomb

AMERICAN EXPERIENCE: At the dawn of the Cold War, the United States initiated a top secret programme in New Mexico to build a weapon even more powerful than the atomic bomb dropped on Japan. A world away, on the frozen steppes of Siberia, the Soviet Union began a similar effort. This two-part documentary reveals how a web of spies and scientists, intrigue and deception marked the race to develop the hydrogen bomb, a weapon that would change the world. Part 1 of 2.