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British-born Australian World Champion Marathon Swimmer and world record in open water swimming, Penny Palfrey (C), accompanied by her husband Chris Palfrey (L) and Cuban commodore of the Nautic Club, Jose Miguel Diaz, gives a press conference in Havana on June 28, 2012. Penny is in Cuba to try and swim -- without the aid of a shark cage -- across the Florida Strait from Havana to Key West, in the US, to celebrate the 20th anniversary of the Ernest Hemingway Nautical Club of Havana.  AFP PHOTO/ADALBERTO ROQUE        (Photo credit should read ADALBERTO ROQUE/AFP/GettyImages)
British-born Australian World Champion Marathon Swimmer and world record in open water swimming, Penny Palfrey (C), accompanied by her husband Chris Palfrey (L) and Cuban commodore of the Nautic Club, Jose Miguel Diaz, gives a press conference in Havana on June 28, 2012. Penny is in Cuba to try and swim -- without the aid of a shark cage -- across the Florida Strait from Havana to Key West, in the US, to celebrate the 20th anniversary of the Ernest Hemingway Nautical Club of Havana.  AFP PHOTO/ADALBERTO ROQUE        (Photo credit should read ADALBERTO ROQUE/AFP/GettyImages)

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    Palfrey abandons swim from Cuba to U.S.

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Palfrey abandons swim from Cuba to U.S.

A 49-year-old woman attempting to swim from Cuba to the Florida Keys unassisted ended her bid early Sunday morning.

Palfrey abandons swim from Cuba to U.S.

A 49-year-old woman attempting to swim from Cuba to the Florida Keys unassisted ended her bid early Sunday morning.