SUNDIAL Bomb

In 1954, shortly after the 15 megaton Castle Bravo nuclear explosion, Edward Teller, the "father of the H-bomb," proposed a new weapon known as the SUNDIAL. Its explosive yield was proposed to be 10,000 megatons or 10 gigatons. To put it into perspective, the largest bomb ever detonated, the Tsar Bomba, could at its maximum yield have been 100 megatons. The SUNDIAL would have been 100x more powerful than the Tsar Bomba and could scorch an area the size of France or Texas. The project was axed by the Air Force.