CNN  told the story of Diana Nyad's milestone August swim  in an  hourlong documentary last weekend, Diana Nyad: Xtreme Dream.

On Friday night, Nyad began yet another chapter, jumping into the water in Havana, Cuba, trying once more to set a distance record for open-water swimming without a shark cage.

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Friday night, she was stung multiple times by a Portuguese man-of-war, according to her blog, and on Saturday morning, the blog said, she was struggling in the water, believing she was not getting adequate oxygen to her muscles.

Diana's blog and stroke tracker

Just before 9 a.m. Saturday, her handlers tweeted that she was  about 25 miles off Cuba. Her team expects the 100-mile-plus swim will take as long as 60 hours.

In the August attempt, she was pulled her from the water after almost 29 hours.