Beginning in the 1950s, American and Soviet scientists engaged in a dangerous race to see who could build and detonate the world's largest bomb. The results exceeded all expectations about how big a bomb could be built. This is a story where the United States led the way, but then left the field clear for the Soviet Union to break all records. Terrifyingly, the bomb-makers on both sides were flying blind as they pushed the technology far into unknown territory. The story of the race to build the world's biggest bomb has never been fully told. But this 50-year anniversary provides the perfect opportunity share this chilling story with the world.