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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Diana Nyad's historic swim questioned

Doubters question whether swimmer Diana Nyad had help to complete her historic journey from Cuba to Florida.

Diana Nyad's historic swim questioned

Doubters question whether swimmer Diana Nyad had help to complete her historic journey from Cuba to Florida.