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On top of the tower an unbearably bright light blazed up. For a
moment or two it dimmed and then with new force began to grow
quickly. The white fireball engulfed the tower and the shop and,
expanding rapidly, changing color, it rushed upwards. The blast wave
at the base, sweeping in its path structures, stone houses, machines,
rolled like a billow from the center, mixing up stones, logs of wood,
pieces of metal, and dust into one chaotic mass. The fireball, rising and
revolving, turned orange, red. Then dark streaks appeared. Streams of
dust, fragments of brick and board were drawn in after it, as into a fun-
nel. Overtaking the firestorm, the shock wave, hitting the upper layers
of the atmosphere, passed through several levels of inversion, and
there, as in a cloud chamber, the condensation of water vapor began.
. . . A strong wind muddled the sound, and it reached us like a roar
of an avalanche. Above the testing ground there grew a grey column
of sand, dust, and fog with a copula-shaped top, intersected by two
tiers of cloud and layers of inversion. The upper part . . . reaching a
height of 6–8 kilometers, recalled a copula of cumulus storm-clouds.
The atomic mushroom was blown to the south, losing its outlines, and
turning into a formless torn heap of clouds one might see after a
gigantic fire.
The August 1949 explosion was the first of 456 nuclear tests, 116 in
the atmosphere and the rest underground, that the Soviet regime con-
ducted at its Semipalatinsk nuclear test site in Kazakhstan. It was, by far,
the Soviet Union’s busiest test site. With the development of thermonu-
clear, or hydrogen, bombs—bombs based on the principle of fusion rather
than fission—in the 1950s, many of the explosions dwarfed the one test
of August 1949. Some of them cracked walls in towns more than 50 miles
from the test site. The Soviet Union’s first fusion-type device, 20 times
more powerful than the August 1949 bomb, was tested at Semipalatinsk
in August 1953. Its first true hydrogen fusion bomb, whose explosive
force of 1.6 million tons of TNT made it more than 70 times more pow-
erful than the August 1949 test, was detonated in the Kazakh sky in
November 1955. After the Soviet Union signed the 1963 treaty that
banned nuclear tests in the atmosphere, all tests were conducted under-
ground. Altogether, the hundreds of atomic tests the Soviet Union con-
ducted in Kazakhstan were equal to about 20,000 of the bombs they
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