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'Hardtack Umbrella' underwater nuclear test - June 1958

Hardtack Umbrella (yield 8 kt) - an underwater nuclear test conducted by the U.S. on 8 June 1958 at Enewetak Atoll. Test name was inspired from North American tree.

 

Image in the public domain

Image: U.S Government

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Taken on August 25, 2010