ツァーリ・ボンバ
Khrushchev announced the upcoming tests of a 50-Mt bomb in his opening report at the 22nd Congress of the Communist Party of the Soviet Union on October 17, 1961. Before the official announcement, in a casual conversation, he told an American politician about the bomb, and this information was published on September 8, 1961, in "The New York Times". The Tsar Bomba was tested on October 30, 1961.