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Kulka had no idea where to find the locking pin in the large and complicated bomb-release mechanism. After a tense 12 minutes searching for the pin, the bombardier decided, correctly, that it must be high up in the bomb bay and invisible because of the curvature of the bomb. A short man, he jumped to pull himself up to get a look at where he thought the locking pin should be. Unfortunately, he evidently chose the emergency bomb-release mechanism for his handhold. The weapon dropped from its shackle and rested momentarily on the closed bomb-bay doors with Captain Kulka splayed across it in the manner of Slim Pickens in Dr. Strangelove. Kulka grabbed at a bag that had providentially been stored in the bomb bay, while the more-than-three-ton bomb broke open the bomb-bay doors and fell earthward. The bag Kulka was holding came loose, and he found himself sliding after the bomb without his parachute. He managed to grab something-he wasn't sure what-and haul himself to safety.
Moments later the plane was rocked by the shock wave of the blast when the bomb hit the ground.
The bombs fell to earth after a B-52 bomber broke up in mid-air, and one of the devices behaved precisely as a nuclear weapon was designed to behave in warfare: its parachute opened, its trigger mechanisms engaged, and only one low-voltage switch prevented untold carnage.
Each bomb carried a payload of 4 megatons – the equivalent of 4 million tons of TNT explosive. Had the device detonated, lethal fallout could have been deposited over Washington, Baltimore, Philadelphia and as far north as New York city – putting millions of lives at risk.
Lapp wrote in Kill and Overkill that each device involved in the Goldsboro incident was equipped with “six interlocking safety mechanisms, all of which had to be triggered in sequence to explode the bomb.” Lapp said that “five of the six interlocks had been set off by the fall…” and thus, “only a single switch prevented the bomb from detonating and spreading fire and destruction over a wide area.”
But in the newly-published document, a senior engineer in the Sandia national laboratories responsible for the mechanical safety of nuclear weapons concludes that "one simple, dynamo-technology, low voltage switch stood between the United States and a major catastrophe".
"The US government has consistently tried to withhold information from the American people in order to prevent questions being asked about our nuclear weapons policy," he said. "We were told there was no possibility of these weapons accidentally detonating, yet here's one that very nearly did."