Michael Phelps, the world's most decorated Olympian and a swimmer nicknamed the "Flying Fish", has gone head-to-head against a Great White Shark in a 100m race 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.