Diana Nyad has defended her 177-kilometre swim from Cuba to Florida to skeptics who questioned whether she got into or held onto a boat during part of the journey.
Nyad said she swam without holding onto any of the boats or people accompanying her.
"I swam. We made it, our team, in squeaky-clean, ethical fashion," Nyad said.
Her critics are suspicious about long stretches of the 53-hour swim were Nyad appeared to have either picked up incredible speed or to have gone without food or drink.
Since Nyad finished her swim on September 2 in Key West, long-distance swimmers have been debating it on social media and in online forums.
Nyad's speed, at some points more than doubling, has drawn particular scrutiny. Her team has attributed her speed to the fast-moving Gulf Stream flowing in her favor.
The 64-year-old endurance athlete and her team held a conference call with some of the skeptics who questioned her navigator's credentials and observations of the currents.
"Many of us are pursuing this as a technical matter," said kayaker and attorney Richard Clifford. "Having the information out there helps us analyze it, measure it, test it, smell it, you know, decide if it looks right and is right, and you guys keep saying it is. So, let us look at it."
Nyad's navigator, John Bartlett, said her fastest speed averaged 6.39 kph over a 5.5-hour period over about 30.58 kilometres, crossing the strongest parts of the Gulf Stream, which was flowing at a favorable angle.
"What you're seeing is the combination of the speed of Diana propelling herself in the water and the speed of the current carrying us across the bottom," he said.
Evan Morrison, co-founder of the online Marathon Swimmers Forum, says it will be interesting to compare observations made by Nyad's navigator with publically available data about the currents Nyad swam.
Nyad attempted the swim from Cuba to Florida four times before finally completing the journey on her fifth attempt, making her the first to make it without the aid of a shark cage.
She did follow a streamer dangled in the water by her team and used a specialized mask and bodysuit to protect herself from venomous jellyfish, which are considered a more serious threat than sharks in those waters. There are some members of the marathon swimming communities who say these methods violated the traditions of her sport.
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