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.)
Novaya Zemlya Russians knew of Novaya Zemlya from the 11th century, when hunters from Novgorod visited the area. For western Europeans, the search for the Northern Sea Route in the 16th century led to its exploration. The first visit from a west European was by Hugh Willoughby in 1553. Dutch explorer Willem Barentsz reached the west coast of Novaya Zemlya in 1594, and in a subsequent expedition of 1596 rounded the Northern point and wintered on the Northeast coast. (Barentsz died during the expedition, and may have been buried on the Northern island.) During a later voyage by Fyodor Litke in 1821–1824,