Endurance swimmer Diana Nyad, right, and her trainer Bonnie Stoll hug after Nyad walks ashore Monday in Key West, Fla., after swimming from Cuba. Nyad became the first person to swim from Cuba to Florida without the help of a shark cage.

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Diana Nyad’s Cuba-to-Florida swim

Endurance swimmer Diana Nyad, right, and her trainer Bonnie Stoll hug after Nyad walks ashore Monday in Key West, Fla., after swimming from Cuba. Nyad became the first person to swim from Cuba to Florida without the help of a shark cage. (J Pat Carter / Associated Press)

The support team accompanying her has equipment that generates a faint electrical field around her designed to keep sharks at bay, and a boat drags a line to help keep her on course. (Ramon Espinosa / Associated Press)

Nyad, who recently turned 64, tried to swim the Strait three times in 2011 and 2012. She had also tried in 1978. (Alejandro Ernesto / EPA)

Nyad waves after starting her fifth attempt to swim between Cuba and Florida. (Ernesto Mastrascusa / EPA)

Nyad began her journey Saturday morning when she jumped from the seawall of the Hemingway Marina into the warm waters off Havana. (Ramon Espinosa / Associated Press)

Nyad gets ready to swim in a three-day nonstop journey from Havana to Florida at the Ernest Hemingway Nautical Club in Havana. (Yamil Lage / AFPGetty Images)

Nyad, 64, salutes before her swim. The endurance athlete launched another bid to set an open-water record by swimming from Havana to the Florida Keys without a protective shark cage. (Ramon Espinosa / Associated Press)

U.S. swimmer Diana Nyad speaks at a press conference held at the Ernest Hemingway Nautical Club in Havana on Saturday. Nyad plans to swim from Havana to Florida in a three-day nonstop attempt. (Yamil Lage / AFPGetty Images)