# The 280 mm Gun at the Nevada Proving Ground

The testing of the Mark 9 atomic artillery shell was the Grable event, part of a much larger series of nuclear detonations under the umbrella of Operation UPSHOT-KNOTHOLE in 1953. This operation conducted at the Nevada Test Site consisted of 11 atmospheric tests. There were three airdrops, seven tower tests, and one airburst. Conducted between March 17 and June 4, 1953, this operation involved the testing of new theories. A new and revolutionary method of producing deliverable nuclear weapons was successfully tested. Approximately 21,000 Department of Defense military and civilian personnel participated in Operation UPSHOT-KNOTHOLE as part of the DESERT ROCK V exercise. Unfortunately, Operation UPSHOT-KNOTHOLE, particularly the "Harry" test, drew a great deal of criticism as resultant fallout levels produced increased offsite radiation exposures. The tests comprising the 1953 Operation UPSHOT-KNOTHOLE were as follows: ANNIE, March 17, tower, weapons related, 16 kilotons (kt) NANCY, March 24, tower, weapons related, 24 kt RUTH, March 31, tower, weapons related, 200 tons DIXIE, April 6, airdrop, weapons related, 11 kt RAY, April 11, tower, weapons related, 200 tons BADGER, April 18, tower, weapons related, 23 kt SIMON, April 25, tower, weapons related, 43 kt ENCORE, May 8, airdrop, weapons effects, 27 kt \[an important test in correlating blastwave and devastating precursor wave formation data of the Grable event\] HARRY, May 19, tower, weapons related, 32 kt GRABLE, May 25,…

- Kind: Short
- Year: 1953
- Runtime: 10 min
- By: AFSWP
- Genres: War
- Archive: [Internet Archive](https://archive.org/details/The280mmGunattheNevadaProvingGround1953)
- Licence or status: [CC BY-NC-ND 2.5](http://creativecommons.org/licenses/by-nc-nd/2.5/) (as the archive states it)
- Who can watch: Teens profiles and older (the archive gives no rating; placed by Invisible Network from its collection and subjects)

[Watch now](https://invisiblenetwork.ai/watch/archive/ia/The280mmGunattheNevadaProvingGround1953?play=1)