diana nyad swim gi Diana Nyad swimming from Cuba to Florida    at age 61 [Updated]UPDATE: Nyad didn’t make her goal. Rougher-than-expected weather and a bout of asthma  forced her to end her swim about 12:45 a.m. ET Tuesday after 30 hours in the water.

“I would be lying to say I’m not deeply, deeply disappointed,” she tells CNN. “This was a big dream, not just of the last two years but some 30 years ago when I tried it.”

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Record-setting marathon swimmer Diana Nyad is attempting to be the first person to swim from Havana, Cuba, to Key West, Fla., without a shark cage. That’s amazing on its own.

The fact that Nyad is a couple weeks shy of her 62nd birthday — and hasn’t attempted a swim this long in more than 30 years — is downright remarkable.

Nyad entered the water in Havana at 7:45 p.m. ET Sunday (Aug. 7) to attempt the 103-mile swim from Havana to Key West. It’s her second try at covering this distance; she previously attempted it in 1978 but had to stop after about 42 hours in the water because rough seas were pushing her too far off course.

As of this posting, she had covered about 46 miles in 24 hours. You can track her progress at CNN.com; her team is also providing regular updates on her “Xtreme Dream” on Facebook and Twitter. If the weather and her body cooperate, she should reach the shore in Key West on Wednesday.

Nyad is attempting to become the first person to make the Cuba-to-Florida swim without being encased in a shark cage (swimmer Susie Maroney covered the distance inside a cage in 1997). Kayakers equipped with electrical devices designed to repel sharks are flanking her, and divers are also on hand in case the electric shields fail.

“To swim between these two neighbors, Cuba & the United States, who’ve been strangers all these years, is a moving thing for me,” Nyad said via Twitter Monday evening. We hope she makes it the rest of the way.

Posted by:Rick Porter