Hydrogen bombs — the world’s deadliest weapons — have no theoretical size limit. The more fuel, the bigger the explosion. When the United States in 1952 detonated the world’s first, its destructive force was 700 times as great as that of the atomic bomb that destroyed Hiroshima.
And in the darkest days of the Cold War, the Soviets and the Americans didn’t only compete to build the most weapons. They each sought at times to build the biggest bomb of all.
The ‘Tsar Bomba’ exploded with the force of an estimated 50 million tons of TNT.