Annie Nuclear Blast-Operation Upshot-Knothole Civil Defense Test
The first nuclear test in Operation Upshot-Knothole, Annie was a 16-kiloton tower shot conducted in Yucca Flat on March 17, 1953. It was the first test in Operation Doorstep part of a civil defense study involving houses, cars and other civilian structures. See more test shot videos in the Nevada Test Site 60th Anniversary interactive with historic footage, maps, timeline and more.






