The Tsar Bomba is the most powerful weapon ever designed ... The massive weapon has a huge fireball radius of 6.72 kilometers, and everything within this area is "effectively vaporized".

The simulation for Russia's Tsar Bomba also showed the heavy blast damage radius, where heavily built concrete buildings would be damaged or demolished and deaths would reach 100 percent.

The ring of absolute destruction had a 35 km [28-mile] radius." The Tzar Bomba's fireball ... weapons from being built. Video of the Tsar Bomba detonation can be found here, as part of an episode ...