Meet six of the indispensable people who will help Diana Nyad along her 103-mile journey.
What do you think about during a nine-hour training swim? The open-water swimmer lets us in on the extreme loneliness that accompanies long-distance swimming.
To fuel impossibly long training swims, she's eating up to 9,000 calories a day, and most of it's not even solid food.
The planned swim from Cuba to Florida is more than 100 miles. There's no training manual for this kind of swim, so Nyad's had to make it up as she goes along.
The 61-year-old is trying to do what she couldn't at 28. No stopping. No shark cage.