TSAR BOMBA, the largest, most powerful nuclear weapon ever detonated. Developed by the Soviet Union, with a yield of 59 million tonnes of TNT. The subsequent mushroom cloud was about 64 kilometres (40 mi) high (nearly seven times higher than Mount Everest) and 40 kilometres (25 mi) wide. Blast radius at 1000 km, with the shockwave circling the earth thrice causing a earthquake from 5.1-7.1 on the richter scale ... Russian Tsar Hydrogen Bomb Explosion