Castle Bravo contamination[edit]
The unexpectedly large yield, combined with other factors, led to the most significant accidental radiological contamination caused by the United States. A few minutes after the detonation, blast debris began to fall on Eneu/Enyu Island on Bikini Atoll where the U.S crew that triggered the device were located. When their geiger counters detected the unexpected fallout, they were forced to shelter in place indoors for a number of hours before it was safe enough for an airlift rescue operation to be carried out.[18]
After impacting Eneu, the fallout continued to spread across the inhabited islands of the Rongelap, Rongerik, and Utrik Atolls. The inhabitants of Rongelap and Rongerik Atolls were evacuated by US servicemen two days after the detonation, but the residents of the more distant Utrik Atoll weren't evacuated for three days.[19][20] Many of the inhabitants soon began to show symptoms of acute radiation syndrome. They returned to the islands three years later but were forced to relocate again when their islands were found to be unsafe.[21]
https://en.wikipedia.org/wiki/Nuclear_testing_at_Bikini_AtollI don't know why test with *huge* nukes. Maybe smaller "mock" models would work as well.
Unless it is to show how much military power you have if you can manufacture super gigantic heavy nuke bombs.
