The Tsar Bomba (Царь-бомба) was the largest, most powerful thermonuclear weapon ever detonated. It was a three-stage hydrogen bomb with a yield of about 50 megatons.[51] This is equivalent to ten times the amount of all the explosives used in World War II combined.[52] It was detonated on October 30, 1961, in the Novaya Zemlya archipelago, and was capable of approximately 100 megatons, but was purposely reduced shortly before the launch. Although weaponized, it was not entered into service; it was simply a demonstrative testing of the capabilities of the Soviet Union's military technology at that time. The heat of the explosion was estimated to potentially inflict third degree burns at 100 km distance of clear air.