Australian swimmer Chloe McCardel prepares to jump into the water at Hemingway Marina to start her swim to Florida from Havana, Cuba, Wednesday, June 12, 2013. McCardel, 29, is bidding to become the first person to make the Straits of Florida crossing without the protection of a shark cage. American Diana Nyad and Australian Penny Palfrey have attempted the crossing four times between them since 2011, but each time threw in the towel part way through due to injury, jellyfish stings or strong currents. Australian Susie Maroney did it in 1997, but with a shark cage. (AP Photo / Ramon Espinosa)

Associated Press
Australian swimmer Chloe McCardel prepares to jump into the water at Hemingway Marina to start her swim to Florida from Havana, Cuba, Wednesday, June 12, 2013. McCardel, 29, is bidding to become the first person to make the Straits of Florida crossing without the protection of a shark cage. American Diana Nyad and Australian Penny Palfrey have attempted the crossing four times between them since 2011, but each time threw in the towel part way through due to injury, jellyfish stings or strong currents. Australian Susie Maroney did it in 1997, but with a shark cage. (AP Photo / Ramon Espinosa)
Australian swimmer Chloe McCardel prepares to jump into the water at Hemingway Marina to start her swim to Florida from Havana, Cuba, Wednesday, June 12, 2013. McCardel, 29, is bidding to become the first person to make the Straits of Florida crossing without the protection of a shark cage. American Diana Nyad and Australian Penny Palfrey have attempted the crossing four times between them since 2011, but each time threw in the towel part way through due to injury, jellyfish stings or strong currents. Australian Susie Maroney did it in 1997, but with a shark cage. (AP Photo / Ramon Espinosa)
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