Michael Phelps
Courtesy of: Azaria Basile
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SANTA CLARA, California, June 20. THANKS to the amazing work of the guys at TakeItLive.TV, in partnership with USA Swimming, here's some incredible underwater footage of The Greatest of All Time Michael Phelps doing what he does best -- the butterfly.

Not only did USA Swimming provide some unbelievable footage, they also slowed it down enough so that you can truly appreciate his ability.