Today marks the 75th anniversary of the second nuclear blast at Bikini Atoll, July 25, 1946.
THe test, dubbed Test Baker of Operation Crossroads, detonated a 23 kiloton bomb known as Helen of Bikini 90 feet under the surface of the water. It was suspended under a landing craft, no remains of which were ever found. Ten ships were sunk, and any ships that remained within a thousand yards were seriously damaged from below.