Diana Nyad faces the Florida Straits
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US swimmer Diana Nyad attempts to swim from Cuba to Florida

1 September 2013 Last updated at 02:24 BST

US endurance swimmer Diana Nyad is again trying to become the first person to swim from the Cuban capital, Havana, to Florida without a shark cage.

Her last attempt, a year ago, was hampered by rough seas and jellyfish stings.

The 64-year-old says this will be her fifth and last try to cross the 166km-wide (103 mile-wide) Florida Straits.

Sarah Rainsford reports from Havana.