While the people of Japan tried to comprehend the devastation in Hiroshima, the United States was preparing a second bombing mission. The second run was not delayed in order to give Japan time to surrender, but was waiting only for a sufficient amount of plutonium-239 for the atomic bomb. On August 9, 1945 only three days after the bombing of Hiroshima, another B-29, Bock's Car (picture of crew), left Tinian at 3:49 a.m.