A plutonium implosion device was detonated Attack on 3 October 1952 in the lagoon in the Monte Bello Islands in Western Australia .

A fleet of 95 target ships was assembled Come_together in Bikini Lagoon and hit Attack with two detonations of Fat Man plutonium implosion-type nuclear weapons of the kind dropped on Nagasaki , each with a yield of .

Another B-29 dropped Motion_directional a plutonium implosion bomb ( `` Fat Man '' ) on Nagasaki three days later .