British sailor Tony Bullimore had just made himself a cup of tea and was settling down to eat some crackers and corned beef in the galley of his racing boat, the Exide Challenger, when he heard the sound of a crack. "The snap was like a match," he said in a BBC documentary in 1997. That sound was the keel – the flat blade on the yacht's bottom that kept it right-side up – snapping off. It was then that all hell broke loose. "The yacht turned over in literally a few seconds – three, four, five secon