If you thought Hiroshima was the mother of all nukes then you're sadly mistaken. Shown in this image you can see how the Hiroshima dwarfs in comparison.

Wikipedia.com: The Tsar Bomba was a three-stage hydrogen bomb with a yield of about 50 megatons.[2] This is equivalent to all of the explosives used in World War II multiplied by 10.[3] A three-stage H-bomb uses a fission bomb primary to compress a thermonuclear secondary, as in most H-bombs, and then uses energy from the resulting explosion to compress a much larger additional thermonuclear stage (although there is evidence that the Tsar Bomba had a number of third stages rather than a single very large one [2]).

(cont.) The initial three-stage design was capable of approximately 100 Mt, but at a cost of too much radioactive fallout. To limit fallout, the third stage, and possibly the second stage, had a lead tamper instead of a uranium-238 fusion tamper (which greatly amplifies the reaction by fissioning uranium atoms with fast neutrons from the fusion reaction). This eliminated fast fission by the fusion-stage neutrons, so that approximately 97% of the total energy resulted from fusion alone (as such, it was one of the "cleanest" nuclear bombs ever created, generating a very low amount of fallout relative to its yield). There was a strong incentive for this modification since most of the fallout from a test of the bomb would fall on populated Soviet territory.

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