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US swimmer Diana Nyad is less than two miles from completing her journey from Cuba to Florida without a shark cage.
Thousands of well-wishers are waiting on Smathers Beach in Key West, where she will complete her swim attempt.
The support team for US veteran long-distance swimmer Diana Nyad said they are posting Twitter updates "through tears and giddy smiles" as she nears the end of her epic Cuba to Florida journey:
US swimmer Diana Nyad is just two miles from completing her Cuba to Florida swim without a shark cage.
After almost 50 hours swimming the Florida Strait, Ms Nyad said, "I am about to swim my last two miles in the ocean. This is a lifelong dream of mine and I'm very very glad to be with you."
She thanked her support team for their generosity, adding, "Let's get going so we can have a whopping party."
Ms Nyad also apologised for her speech, saying, "I have some bad abrasions in my mouth from the jellyfish mask, so excuse me if I have trouble talking."
Doctors said veteran long-distance swimmer Diana Nyad's tongue and lips are swollen as she makes the final push for the Florida coast.
Dr Kot and Dr Covington, part of Ms Nyad's support team, said her speech is slurred as a result of the swelling.
Although they are concerned about the 64 year old's airways, they have not intervened in her attempt at swimming from Cuba to Florida without a shark cage.
Twitter users have posted messages of support on the social networking site for US swimmer Diana Nyad.
Ms Nyad is closer than ever to becoming the first person to complete the journey from Cuba to Florida without a shark cage:
US veteran long-distance swimmer Diana Nyad is just a few miles away from becoming the first person to complete the 103-mile journey from Cuba to Florida without a shark cage.
Ms Nyad's navigator, John Bartlett, said she was at "a distance not ever having been close to achieved by any other human being before."
US swimmer Diana Nyad said this will be her final attempt at making the 103-mile journey from Cuba to Florida without a shark cage.
Ms Nyad said before beginning the gruelling swim, "I'm learning as I get older, and I'm really getting older now, that there's a fine line between having grace and letting go of something that you have no control over and you're just not going to beat, like Mother Nature maybe."
Veteran long-distance swimmer Diana Nyad is edging closer to becoming the first person to complete the 103-mile journey from Cuba to Florida without a shark cage.
The 64 year old American has made it farther than in any of her previous four attempts and is expected to arrive in Key West later today, according to her representatives.
Ms Nyad's journey began on Saturday morning when she jumped from the seawall of the Hemingway Marina into the waters off Havana with the cry "courage".
She has been swimming the Florida Strait ever since, stopping from time to time for nourishment.