Diana Nyad Beaten by Jellyfishcut on Cuba-to-U.S. Swim

By JENNIFER KAY | September 26, 2011 | 3:30 AM EDT

In this photo released by the Florida Keys News Bureau, endurance swimmer Diana Nyad shows Portuguese Man o’ War jellyfish stings after she arrived in Key West, Fla., Sunday, Sept. 25, 2011, following a third unsuccessful attempt to swim from Havana to the Florida Keys. (AP Photo/Florida Keys News Bureau, Mike Marrero)

KEY WEST, Fla. (AP) — Marathon swimmer Diana Nyad says she's "very disappointed" that she didn't complete the record-setting attempt at a Cuba-Florida swim, but she says she doesn't plan on making another try.

Stepping off her boat Sunlover on Sunday evening, the 62-year-old Nyad said cutting short the swim after 40 hours and multiple Portuguese man o'war stings was "such a bitter pill."

She went on to say, "I am so capable of that swim. That's the end, though."

Nyad quit her swim Sunday morning after swimming past sharks, barracudas and smacks of men o'war in the waters between Cuba and the Florida Keys. She said she could have fought through bad weather or medical problems, but her medics said more stings from the venomous creatures might have killed her.