BALTIMORE (WJZ) — Michael Phelps, the most decorated Olympian of all time, with 23 Olympic golds and 39 world records in the pool, will test his speed against a Great White Shark.

Phelps said, “I guess it was more exhilarating than really anything that maybe I’ve done outside of a pool, and I think that was something that surprised me the most.”

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To prepare for the show, Phelps swam with the team of the Bimini Shark Lab to give him a crash course to “teach him how to safely dive with sharks — including how to stay calm when a hammerhead swims two feet above his face.”

Phelps said, “We had an abundance of divers underneath of me and camera guys all over the place, so I felt very safe and comfortable.”

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Still, something did make him nervous…

You’ll have to tune in to see how it all plays out when Phelps vs. Shark: Great Gold vs. Great White kicks off July 23 on Discovery.

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Shark Week closes July 30 with a second special featuring the GOAT, Shark School With Michael Phelps.