Orange Herald

Orange Herald was a British nuclear weapon, tested on May 31, 1957. At the time it was reported as an H-bomb, although in fact it was a large boosted fission weapon and remains to date, the largest fission device ever detonated at 720 kilotons.

Yield: 720 Kilotons
Location: Malden Island, Kiribati
Date: May 31, 1957

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