On November 16, 1952 at 11:30 local time (23:30 GMT) a B-36H bomber dropped the bomb over a point 2,000 feet (610 m) north of Runit Island in the Enewetak atoll, resulting in a 500 kiloton explosion at 1,480 feet (450 m).
It saw actual on-the-ground work done, of the most unusual kind: on March 23, 1971, three 15-kiloton underground nuclear charges were exploded near the village of Vasyukovo in Cherdynsky District of Perm Oblast, some 100 km north of the town of Krasnovishersk.
The complex was designed and built to sustain a direct hit from a 20-kiloton nuclear bomb, equivalent to the one dropped on Nagasaki.