Tsar Bomba - RDS-220 Hydrogen Bomb

The Tsar Bomba (Russian: Царь-бо́мба) (code name: Ivan or Vanya), also known by the alphanumerical designation "AN602", was a hydrogen aerial bomb, and the most powerful nuclear weapon ever created and tested. Tsar Bomba was developed in the Soviet Union (USSR) by a group of nuclear physicists under the leadership of Igor Kurchatov, an academician of the Academy of Sciences of the Soviet Union.

Tested on 30 October 1961, the scientific result of the test was the experimental verification of calculation principles and multi-stage thermonuclear charges. The bomb was dropped by parachute from a Tu-95V aircraft, and detonated autonomously 4,000 metres (13,000 ft) above the cape Sukhoy Nos of Severny Island, Novaya Zemlya, 15 km (9.3 mi) from Mityushikha Bay, north of the Matochkin Strait. The detonation was intended to be secret, but was detected by United States intelligence agencies, via a KC-135A aircraft (Operation SpeedLight) in the area at the time. A secret U.S. reconnaissance aircraft named "Speed Light Alpha" monitored the blast, coming close enough to have its antiradiation paint scorched.