Human v Shark!

Olympic superhero Michael Phelps is one of the fastest swimmers on Earth, but he's been taking up a pretty weird challenge.

He's been racing sharks... Yes, you read that right.

Michael Phelps had a special shark suit to help him compete against the ocean predator.

And don't worry - he actually wasn't in the water with them, it was done with special effects.

Watch this to see who was the fastest...

Pictures courtesy of Discovery

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