Nightly News   |  August 21, 2012

Swimmer Diana Nyad: ‘I am not a quitter’

Suffering from exhaustion, hypothermia and swollen lips, Nyad was forced to end her attempted 103-mile crossing from Cuba to Key West. It was her fourth attempt to swim from Cuba to Florida without a shark cage – and had she succeeded, she would have been the first person to do so. NBC’s Mark Potter reports.

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