527B

527B is a nuclear test conducted by the United States at the Enewetak Atoll in the Marshall Islands on October 30, 1958. The test was a part of Operation Hardtack-I, a series of high-yield nuclear tests conducted by the US in 1958. 527B was a nuclear fission test, also known as a "shot-test".

The test detonated a device with an estimated yield of 5 kilotons of TNT, an moderate-sized yield for a nuclear test. The test was part of a broader effort by the US to expand its nuclear testing capabilities and improve its understanding of nuclear physics. The test was also notable for its use of a unique device design, reportedly a "cavity implosion" design.

The test was monitored by a team of scientists and observers, who collected data on the test's energy release and environmental effects. The test's characteristics were later reported in the "Military Effects of Nuclear Detonations" study, commissioned by the US Defense Department.

Reports indicate that the test created several observable effects in the surrounding area, including a large crater formed by the blast, and a distinctive mushroom cloud that rose above the atoll. The test's environmental effects, including radioactive fallout, were also noted by observers.

Records of the test suggest that it was conducted in a relatively pristine environment, with little contamination from previous tests. As a result, the test provided valuable data for scientists studying the effects of nuclear detonations. Overall, the 527B test adds to the body of knowledge gained from nuclear testing, while also providing a historical snapshot of the nuclear research conducted by the United States in the 1950s.