September 9th, 2013
11:18 AM ET

Some Question Diana Nyad's Historic Swim

Some long-distance swimmers are questioning Diana Nyad's historic journey from Cuba to Florida, CNN's Miguel Marquez reports.

The 64-year-old swam 110 miles for 53 hours in shark infested waters but other athletes now want to know did she really swim completely unassisted? Did she rest on a boat? Hold onto a canoe? Was she ever pulled along?

Skeptics speaking to National Geographic and blogging on "The Marathon Swimmers Forum" point to one 9 hour-stretch, when Nyad sped up to more than twice her average speed.

They want her GPS, surface-current, weather, eating and drinking data released to verify her claim of conquering a swim once considered impossible.

Nyad's team promise a point-by-point response.

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