Tsar Bomba (Russian: Царь-бомба; "Tsar-bomb") was the Western nickname for the Soviet RDS-220 hydrogen bomb (code name Vanya), the most powerful nuclear weapon ever detonated. Its test on October 30, 1961, remains the most powerful human-made explosion in history. It was also referred to as Kuzkina mat (Russian: Кузькина мать; "Kuzma's mother"), possibly referring to Nikita Khrushchev's promise to show the United States a Kuzkina mat (an idiom roughly translating to "We'll show you!") at a 1960 session of United Nations General Assembly. Developed by the Soviet Union, the bomb had a yield of 50 megaton TNT (210 PJ). In theory, the bomb had a maximum yield of 100 megatons if it were to have included a U-238 tamper, but because only one bomb was built, this theory was never demonstrated. The