The Lost Tybee Bomb February 5, 1958. A B-47 collides over Georgia. The pilot jettisons a hydrogen bomb. It splashes into Wassaw Sound. The Air Force searched for nine weeks. They never found it. It is still down there today.
Source
US Department of Defense, 1981, 'Narrative Summaries of Accidents Involving U.S. Nuclear Weapons 1950-1980'
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