Test 219 was a nuclear test conducted by the Soviet Union in the atmosphere via ICBM.
It was a thermonuclear fusion bomb with a yield of about 24.4 megatons and a destruction radius of about 6 mi (9.7 km), making it the second largest thermonuclear explosion in history, only behind the Tsar Bomba test.
[1] It exploded at height of 2.44 mi (3.75 km).
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