She's in the water without a shark cage, relying on electronic shark repellent and a team of divers to keep them away.

CNN: August 20, 2012 -- Updated 1157 GMT (1957 HKT)

Speaking of sharks, Nyad is attempting the swim without a physical shark cage, and she is relying on an electronic shark repellent device and a team of divers to keep them away.

CNN: Diana Nyad making fourth attempt at Cuba-to-Florida swim