"On Feb. 5, 1958, a B-47 bomber dropped a 7,000-pound nuclear bomb into the waters off Tybee Island, Ga., after it collided with another Air Force jet. Fifty years later, the bomb -- which has unknown quantities of radioactive material -- has never been found."
There's also one missing off the coast of GA:
https://www.npr.org/templates/story/story.php?storyId=185876...
"On Feb. 5, 1958, a B-47 bomber dropped a 7,000-pound nuclear bomb into the waters off Tybee Island, Ga., after it collided with another Air Force jet. Fifty years later, the bomb -- which has unknown quantities of radioactive material -- has never been found."