'Shark Week' Viewers Upset Michael Phelps Didn't Race an Actual Shark

Michael Phelps vs the shark screen grab - H 2017
Screengrab/Courtesy of Discovery Channel

"So you mean to tell me Michael Phelps didn't even race a real shark? It was just a simulation. I'm mad. More like Shark WEAK!" wrote one Twitter user.

Michael Phelps raced a great white shark for a Shark Week special that aired Sunday night on Discovery Channel.

But apart from stepping into a cage to get up close and personal with the sea creature, Phelps was not actually swimming in the water alongside the shark. Instead, data on the shark's top swimming speed was collected, and producers used CGI to simulate a shark swimming in the water side-by-side with Phelps. This left many viewers disappointed, and they hit Twitter to share their reactions.

Below, a sample of what they're saying about the race.