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.)
History of Franz Josef Land the southern and central parts of the archipelago had been explored. At the time there was a presumption that a large landmass, tentatively called Petermann Land, stretched northwards, possibly all the way to the pole. To the west another landmass was expected, Gillis Land, which it was expected might reach as far as Svalbard. Frederick George Jackson hoped to exploit the previous expeditions' experience with overwintering to launch an expedition to explore the northern parts of the island group. To prepare for the trip, in 1893 he took an expedition to Yugorsky Strait and Vaygach Island, south of Novaya Zemlya.