Michael Phelps head-to-head against a Great White Shark in a 100m race
Michael Phelps, the world's most decorated Olympian and a swimmer nicknamed the "Flying Fish", has gone set to be broadcast by the Discovery network.
Although the athlete represents the peak of human athletic prowess, he still can only swim at a top speed of 5-6mph (8-10km/h) an hour, slower than the shark.
To even things up, the US swimmer wore a "monofin" for the open water race in South Africa, increasing his speed significantly but still not taking it anywhere close to the at least 25mph a Great White is capable of in short bursts.
And - spoiler alert - the athlete has revealed they were not in the water "at the exact same time" for safety reasons.