Endurance swimmer Diana Nyad has ended her fourth bid to swim from Cuba to Florida after four days of storms, jellyfish stings and shark threats.
Nyad's support team posted on her blog that the athlete made the call after being pulled from the water a day before her 63rd birthday.
Nyad left Havana on Saturday in her third attempt since last year to be the first person to swim the Florida Straits without a shark cage. She also failed once earlier to do so with a cage.
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