Castle Bravo was the first in a series of high-yield thermonuclear weapon design tests conducted Action by the United States at Bikini Atoll , Marshall Islands , as part of `` Operation Castle '' .

Castle Bravo 's yield was 15 megatons of TNT , 2.5 times the predicted 6.0 megatons , due to unforeseen additional reactions involving Cause_to_be_included Li , which led to Causation the unexpected radioactive contamination of areas to the east of Bikini Atoll .

Operation Crossroads was a pair of nuclear weapon tests Testing conducted Action by the United States at Bikini Atoll in mid-1946 .

Bikini 's native residents agreed Agree_or_refuse_to_act to evacuate Escaping the island , and were evacuated Escaping on board the `` LST-861 '' , with most moving to the Rongerik Atoll .

Meanwhile , the Americans built Building new bases from scratch Bodily_harm at places like the Admiralty Islands , Majuro , and Ulithi Atoll , and took over Control the major port at Guam .

Like the Crossroads tests , the Sandstone tests were carried out Action at the Pacific Proving Grounds , although at Enewetak Atoll rather than Bikini Atoll .

Like the Crossroads tests , the Sandstone tests were carried out Action at the Pacific Proving Grounds , although at Enewetak Atoll rather than Bikini Atoll .

Despite lasting for a full month , John barely affected Influence land at all , bringing Bringing only minimal effects to the Hawaiian Islands and the United States military base on Johnston Atoll .