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During a conference call with more than a dozen of her peers Tuesday, Nyad was adamant that her swim was by the book.

“I swam,” she said. “We made it, our team, from the rocks of Cuba to the beach of Florida, in squeaky clean, ethical fashion.”

She said she never held onto a boat or another person “for any kind of flotation or support.”

Her navigator, John Bartlett, described how the team picked up a current that had them moving nearly four miles an hour for several hours on the second day of the nearly 53-hour journey. That’s how and when her speed nearly doubled, he said.

See wptv.com

“In my gut I would be very surprised to learn she did the entire swim unassisted,” said Cassidy.

Cassidy, who also heads the swimming program at St. Andrews High School, questions a gap charted by Nyad’s crew. It is a roughly seven-mile stretch when Nyad apparently did not stop to eat or drink.

“I don’t know if it’s humanly possible to do what some of her crew is asserting she did, that whole swim without any assistance,” said Cassidy.

The South Florida endurance swimmer and coach is not alone.

There are hundreds commenting on posts on Facebook and throughout various swimming blogs.

See also ABC News