Australian swimmer Chloe McCardel waves to spectators as she begins her swim to Florida from the waters off 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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