Timeline Monday 29 August 1949

Events on Monday 29 August 1949 1

• 1949 Soviet Union tests its first atomic bomb RDS-1 detonated at Semipalatinsk The Soviet Union secretly detonated its first nuclear device, codenamed RDS-1 or "First Lightning," at the Semipalatinsk Test Site in Kazakhstan. The test ended the American nuclear monopoly four years after Hiroshima and triggered the Cold War arms race.