Tsar Bomba C), north of the Arctic Circle over the Novaya Zemlya archipelago in the Arctic Ocean. The bomb was dropped from an altitude of ; it was designed to detonate at a height of over the land surface ( above sea level) by barometric sensors. The original, November 1961, United States Atomic Energy Commission estimate of the yield was 55–60 megatons, but since 1992, all Russian sources have stated its yield as 58.6 megatons. First secretary Khrushchev warned in a filmed speech to the Supreme Soviet of the existence of a 100-megaton bomb (technically the design was capable of this yield.)
Yuzhny Island is known for its large seabird population. The island's vegetation largely subsists on tundra. Yuzhny Island Yuzhny () is the southern island of the Novaya Zemlya archipelago, lying north of Russia. It has an area of , which while smaller than the northern island of Severny, makes it one of the largest islands in the world. It is separated from Severny Island by the narrow Matochkin Strait, which is covered with ice most of the year. West of Yuzhny Island lies the Barents Sea, and to the east the Kara Sea. Originally home to the Nenets people, the island was