In January 1961, a B-52 Stratofortress began leaking fuel near Goldsboro, N.C., and the crew were forced to eject before they could reach Seymour Johnson Air Force Base.

They watched as the plane descended toward the tobacco farmland below carrying two 3.8-megaton nuclear weapons. As the plane broke up, it dropped both of them. One smashed into a muddy field, but the other deployed a parachute to slow its descent and activated five of its six arming mechanisms.

It stopped short of detonating, which is good, because it packed more than 250 times the destructive power of the Hiroshima bomb.

“How close was it to exploding?” asked disposal team commander Lt. Jack B. ReVelle afterward. “My opinion is damn close. You might now have a very large Bay of North Carolina if that thing had gone off.”

Only three years earlier, a similar mishap had occurred over Georgia.