More than 50 years after a 7,600lb (3,500kg) nuclear bomb was dropped in US waters following a mid-air military collision, the question of whether the missing weapon still poses a threat remains.
In his own mind, retired 87-year-old Colonel Howard Richardson is a hero responsible for one of the most extraordinary displays of aeronautic skill in the history of the US Air Force.
His view carries a lot of weight and he has a large number of supporters - including the Air Force itself which honoured his feat with a Distinguished Flying Cross.
But to others, he is little short of a villain: the man who 50 years ago dropped a nuclear bomb in US waters, a bomb nobody has been able to find and make safe.
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