Discovery Channel pits Michael Phelps against (CGI) great white in Shark Week promo

Michael Phelps, record holding US swimmer with 23 Olympic gold medals to his name, has (sort of) raced a Great White shark to in a promotion with the Discovery Channel.
The 23-times gold medalist failed to outpace the shark on a 100-metre stretch but only by two seconds. Some viewers expressed disappointment that the Great White was in actual fact a CGI effect based on the recorded swimming speed of the shark.
Scientist Tristan Gutteridge said during the show: “Clearly, we can’t put