The 15-megaton ( Mt ) estimate represents an energy about 1,000 times greater than that of the atomic bomb dropped on Hiroshima , Japan — roughly equal to that of the United States ' Castle Bravo ( 15.2 Mt ) nuclear test in 1954 , and about one-third that of the Soviet Union 's Tsar Bomba explosion in 1961
Castle Bravo
Castle Bravo
Tunguska event