Upshot–Knothole Grable
1953 nuclear artillery test at the Nevada Test Site, United States
Upshot–Knothole Grable
Upshot–Knothole Grable was a nuclear weapons test conducted by the United States as part of Operation Upshot–Knothole. Detonation of the nuclear weapon, a W9 warhead, occurred 19 seconds after its deployment at 8:30am PDT (1530 UTC) on May 25, 1953, in Area 5 of the Nevada Test Site.
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