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A 61-year-old man stranded in the Gulf of Mexico without a life jacket, tread water for 20 hours in a desperate bid to stay alive. William Durden fell off his fishing boat Wednesday while fishing alone. He somehow was able to tread water off the coast of Florida for all those hours while awaiting rescue. Durden, a retired pilot, credits his Navy training for knowing what to do. "They teach you how to drown proof yourself, what position you need to be to stay above the water instead of below it," he said.