bravo

Castle Bravo was the first in a series of high-yield thermonuclear weapon design tests conducted by the United States at Bikini Atoll, Marshall Islands, as part of Operation Castle. Detonated on March 1, 1954, the device was the most powerful nuclear device detonated by the United States and its first lithium-deuteride-fueled thermonuclear weapon. Castle Bravo's yield was 15 megatons of TNT, 2.5 times more than the predicted 6 megatons, due to unforeseen additional reactions involving 7Li, which led to the unexpected radioactive contamination of areas to the east of Bikini Atoll.
Fallout from the detonation fell on residents of Rongelap and Utirik atolls and spread around the world. The islanders were not evacuated until three days later and suffered radiation sickness. Twenty-three crewmembers of the Japanese fishing vessel Daigo Fukuryū Maru ("Lucky Dragon No. 5") were also contaminated by fallout, experiencing acute radiation syndrome. The blast incited international reaction over atmospheric thermonuclear testing.
The Bravo Crater is located at 11°41′50″N 165°16′19″E. The remains of the Castle Bravo causeway are at 11°42′6″N 165°17′7″E.

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