Even Michael Phelps has a limit.

In the lead-up to Discovery Channel’s “Shark Week,” the network had been teasing a race between the Olympic gold medalist and a Great White Shark. Could one of the fastest swimmers on the planet go up against Phelps?

The answer, according to “Phelps vs. Shark: Great Gold vs. Great White,” is yes. Holding 39 world records and 23 Olympic gold medals won’t save you if you go up against a Great White.

Also Read: 'Phelps Vs Shark': Vegas Makes Great White the Mega(lodon) Favorite

The moment of glory for #TeamShark!!! #PhelpsVsShark #SharkWeek pic.twitter.com/NWYp1CwiRa

— Shark Week (@SharkWeek) July 24, 2017

While the race was — unfortunately for many viewers — mostly CGI (guess you can’t have a human get that close to a Great White on TV), it did showcase what a race between the two could look like.

“Clearly, we can’t put Michael in one lane and a shark in the far lane. We have to do simulation. We’ll use our speed data that we’ve (collected) in all our testing,” said Dr. Tristan Guttridge, the scientist leading the effort.

Phelps swam in a 100-meter contest with a wetsuit and a mono-fin designed specifically for the event (in order to simulate a shark’s swimming). He swam in freezing waters off Mossel Bay in South Africa.

Also Read: Shark Week: 9 Memorable Movie & TV Predators, From 'Jaws' to 'Sharknado' (Photos)

As for the shark, researchers developed a way to record its swimming time. That basically involved a guy riding a water bike with bait attached as a Great White trailed behind him.

Don't do this at home. #SharkWeek pic.twitter.com/hgOF0905aq

— Shark Week (@SharkWeek) July 24, 2017

In the end, the CGI shark out-swam Phelps by two seconds — 36.1 vs. 38.1. In an Olympic pool, that would be a humiliating defeat but out in the ocean, it’s probably fine.

Phelps is fine with it too, especially considering the water he was swimming in was freezing. He’ll do better next time, he says.

Rematch? Next time..warmer water. #SW30 @Discovery @SharkWeek

— Michael Phelps (@MichaelPhelps) July 24, 2017

The 13 Tackiest Cannes PR Stunts, From Blake Lively's Sharks to Sacha Baron Cohen's Mankini (Photos)

From a faux terrorist attack to sharks in the French Riviera, promoters often miss the mark with their gaudy Cannes PR stunts.
Faux “Terror Raid” to Promote Oraxy
Guests at Hotel du Cap Eden-Roc got a surprise visit by men outfitted in militia-themed gear last year, who approached the hotel by boat. It was a publicity stunt for the Paris-based Oraxy, which describes itself as “the world’s first private global marketplace reserved exclusively for UHNWI,” or Ultra High Net Worth Individuals.
Sacha Baron Cohen Wears Green Mankini
In 2006, Sacha Baron Cohen sported a bright green male thong known as the “mankini” to promote “Borat! Cultural Learnings of America for Make Benefit Glorious Nation of Kazakhstan.”
Twitter
Sacha Baron Cohen Brings a Camel
In 2012, “The Dictator” actor turned up with two model bodyguards and a camel. He even managed to fall off the camel, which bore a license plate with “Wadiya 1” on it – a reference to the fictional North African Republic of Wadiya, where “The Dictator” was set.
YouTube
T.J. Miller Parachutes in to Debut "Emoji Movie" Trailer
To promote Sony’s “The Emoji Movie,” T.J. Miller parasailed into Cannes before unveiling a trailer for the film, in which he voices Gene, the Meh emoji. Emojis don't feel very Cannes.
Getty Images
"The Shallows" Brings in Fake Sharks
To promote Blake Lively's nautical horror film, Screen Gems planted fake sharks in the French Riviera.

Getty Images
Faux Snow for "A Christmas Carol"
Disney tapped Jim Carrey for a new version of “A Christmas Carol” in 2009 — and decided to bring the holiday spirit to Cannes by covering the Croisette with snow. Not the best example of reading the room or, in this case, the luxurious French beach town in the middle of May. Shout out to Robin Wright and Colin Firth in the background for looking horrified at the faux snowball fight.
Getty Images
Jerry Seinfeld Flies In to Promote "Bee Movie"
In 2007, Jerry Seinfeld took Cannes by air to promote his big animated push for Disney, for which he served as writer and star and recruited pals like Chris Rock. His giant bee costume might have been worse than his notorious “Seinfeld” puffy shirt.
Getty Images
Angelina Jolie, Will Smith Ride Inflatable Shark
Will Smith, Angelina Jolie and Jack Black rode a 14-foot inflatable shark to promote "Shark Tale" in 2004.
Getty Images
"Trolls" Wigs
Anna Kendrick and Justin Timberlake promoted "Trolls" in 2016 with an array of women wearing bright-colored outfits and wigs reminiscent of the costumes in the movie. Also, they're all in gowns -- a play on Cannes fashion?
Getty Images
Gaspar Noe’s Graphic Makeout Posters to Promote “Love”
Gaspar Noe at first shocked -- and then satisfied -- critics with his depiction of sex on film. He was praised for depicting the joyous and fervent act and staying mostly out of the realm of straight-up pornography. Promoting the film, however, was a different story. Producers wallpapered Cannes in posters of a saliva-covered triple kiss and an NSFW image of a penis and a woman's breast after climax.
Dolph Lundgren, Jean-Claude Van Damme Hold Impromptu Stage Fight
Both "Universal Soldier" actors held a stage fight on the steps of a famed staircase in 1992. Many believed it was real, but Lundgren told The Hollywood Reporter that it was planned.
TriStar
Dead pigeons for "24 Hour Party People"
In 2002, actors impersonating the band Happy Mondays mimicked a scene of the movie by throwing fake dead pigeons from the beach onto unsuspecting victims, who believed thousands of dead birds were falling from the sky, the BBC reported.
Film4
Naked Bike Rides
Felix van Groeningen, the filmmaker behind “The Misfortunates,” decided to recreate a scene from his film where a dysfunctional family rides bikes in the nude. Just hours before a press conference, the director and his team disrobed and flew down the Croisette in the buff. A staffer on a motorcycle followed with their underwear, in case French police got a gander at them.
Getty Images