エニウェトク環礁
Bikini Atoll had previously hosted nuclear testing in 1946 as part of "Operation Crossroads" where the world's fourth and fifth atomic weapons were detonated in Bikini Lagoon. Since then, American nuclear weapons testing had moved to the Enewetak Atoll to take advantage of generally larger islands and deeper water. Both atolls were part of the American Pacific Proving Grounds.