Purely History on Instagram: "In 1958, the United States conducted Wahoo, an underwater nuclear test at Enewetak Atoll in the Marshall Islands. A Mark 7 bomb with a yield of 9 kilotons was detonated about 500 feet below the ocean surface. The explosion created a huge plume of water vapor that rose more than half a mile into the air, along with shockwaves strong enough to sink target ships. Wahoo was part of Operation Hardtack I, a series of nuclear tests meant to study how atomic weapons behaved

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