Diana Nyad's historic swim questioned

Image #: 24144968    U.S. long-distance swimmer Diana Nyad , 64, walks to dry sand, completing her swim from Cuba as she arrives in Key West, Florida, September 2, 2013. Nyad has become the first person to swim from Cuba without a shark cage. REUTERS/Andrew Innerarity  (UNITED STATES - Tags: SPORT SWIMMING TPX IMAGES OF THE DAY)       REUTERS /Andrew Innerarity /LANDOV
Image #: 24144968    U.S. long-distance swimmer Diana Nyad , 64, walks to dry sand, completing her swim from Cuba as she arrives in Key West, Florida, September 2, 2013. Nyad has become the first person to swim from Cuba without a shark cage. REUTERS/Andrew Innerarity  (UNITED STATES - Tags: SPORT SWIMMING TPX IMAGES OF THE DAY)       REUTERS /Andrew Innerarity /LANDOV

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    Diana Nyad's historic swim questioned

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