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British-Australian swimmer World Champion Marathon swimmer and world record in open water swimming, Penny Palfrey, dives to swim towards the United States on June 29, 2012 at the Hemingway International Yacht Club in western Havana. Palfrey will launch a historic attempt to swim across the shark-infested waters from Cuba to the United States. Palfrey, a 49-year-old mother of three and grandmother of two, is vying to become the first person to make the 103-mile (165-kilometer) swim across the Florida Straits without a shark cage. The journey is expected to take three days.     AFP PHOTO/STR        (Photo credit should read STR/AFP/GettyImages)
British-Australian swimmer World Champion Marathon swimmer and world record in open water swimming, Penny Palfrey, dives to swim towards the United States on June 29, 2012 at the Hemingway International Yacht Club in western Havana. Palfrey will launch a historic attempt to swim across the shark-infested waters from Cuba to the United States. Palfrey, a 49-year-old mother of three and grandmother of two, is vying to become the first person to make the 103-mile (165-kilometer) swim across the Florida Straits without a shark cage. The journey is expected to take three days.     AFP PHOTO/STR        (Photo credit should read STR/AFP/GettyImages)

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Endurance swimmer halfway to Florida Keys

Endurance swimmer Penny Palfrey, 49, is vying to be the first person to swim the Florida straits without any assistance.

Endurance swimmer halfway to Florida Keys

Endurance swimmer Penny Palfrey, 49, is vying to be the first person to swim the Florida straits without any assistance.