On August 9, 1945, three days after the Hiroshima bombing, a squadron of B-29s was diverted by smoke over Kokura to the alternative target of Nagasaki. At 11:02 a.m., Major Charles Sweeney’s crew released “Fat Man” from the bay of Bockscar. When the atomic bomb exploded at 1,650 feet, it released a blast reaching 7,050° F, a windstorm of 620 mph and a mushroom cloud that rose 45,000 feet. This Atomic Bomb Hypocenter Monument at Nagasaki Peace Park marks the position of greatest impact. Behind it is a pillar from the ruins of Urakami Cathedral.