Diana Nyad Attempts Cuba-Florida Swim Once More

Swimmer battles jellyfish, sharks in her fourth attempt to reach U.S. mainland.
3:00 | 08/20/12

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Transcript for Diana Nyad Attempts Cuba-Florida Swim Once More
you want to be seen. Now to diana nyad. Her swim to florida would make history, just days before her 63rd birthday this week. We've been tracking this all morning long. Her spokes person says she's doing well. Spirits are up. If she does, she'll be swimming into the history books. Take a look. She may be an endurance swummer. This morning, she's inspiring millions with her persistence. For the third time in a year, the 62-year-old dove into the waters off the coast of cuba saturday, hoping to swim all the way to florida and into history. I think the team is 100% prepared. At this hour, she's almost halfway home. Her route from havana to the florida key, in open water, a grueling record-breaking 103 miles. It's a 60-hour journey. The challenges of endurance and muscle fatigue only compounded by the open ocean. That powerful current, sharks without the protection of a shark cage and the relentless threat of skrelly fish and their excruciating stings p. I asked her operations chief how she's holding up. How often is she able to eat? Every hour and a half and every 45 minutes, she'll hit a quick hydration. These are not long stops. Reporter: It's a mission nyad has tried to accomplish for three decades. Last september, she made it 82 miles, swimming more than 40 hours before jelly fish stings forced her to abandon her journey. I knew I could do it. I just couldn't get there. Reporter: This morning, though she's had four painful encounters with jelly fish, she's still on course and still singing. ♪ They said she was not home ♪ Reporter: Prepared she says to paddle through the pain. There's a reason no one's every done it. I may suffer some. I'm prepared for that, too. Reporter: She says she sings from a play list of 65 songs from what she calls her generation, bob dylan, the beatles. bobby McGee, the song from janis joplin. She's in such a good place right now, especially emotionally. She is asking the support boat, hey, how's it going for you? Bianca: Right now on the eyeopener, an armed robbery attempt caught on tape. How a clerk saved his store and it was not the first time someone had to fight back. Jim: A fallriver firefighter injured when flames tear through a triple-decker. Bianca: Saying good-bye to a red sox legend what his own son learned about from red sox fans. Bianca:6:00 a.M. This monday. So glad you're starting your week w us. I'm bianca de la garza. Jim: I'm jim lokay in for randy price. Thousands of evacuations underway in northern california that's raging wildfires show no shine of letting up. Bianca: Maybe your going back to work or on vacation j.C. Has the details. J.C.: Thank you to our facebook fans like kelly in She's so committed and so passionate. We wish her very well. She makes to it key west, she'll get there right before her 63rd birthday.

This transcript has been automatically generated and may not be 100% accurate.

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