Map shows more than 2000 nuclear bombs exploded in last 50 years. The Manhattan Project was set up midway through the Second World War and began work on developing the U.S' nuclear technology. In May 1945 Germany signed a surrender agreement with the Allies to signal the end of the war in Europe, however, the war in the Pacific carried on and the Allies were contemplating invading Japan. They asked Japan to surrender but the Japanese government ignored the Potsdam Declaration on July 26, 1945. By August 1945, the Manhattan Project had developed and tested atomic bombs at its Los Alamos base By August 1945, the Manhattan Project had developed and tested atomic bombs at its Los Alamos base and on 6 August, a Little Boy atomic bomb, left, was dropped on Hiroshima on August 6, 1945, followed by a Fat Man bomb,right, on Nagasaki three days later. The blasts are said to have killed a total of 245,000 deaths by November 1945 and the effects from radiation are still reported to this day. On 15 August, Japan surrendered and signed the Instrument of Surrender on September 2, officially ending World War II.