RIO DE JANEIRO — Like the Chicago River on St. Patrick’s Day, the diving pool at the Rio Summer Olympics has suddenly taken on a bright shade of green.
British diver Tom Daley, who won a bronze medal after diving into clear blue water Monday, tweeted a photo of the pool saying, “Ermmm … what happened?!”
In the last 24 hours, the water in the diving pool — but not the adjacent swimming pool — took on a new emerald shade, worrying some on Twitter.
Ermmm…what happened?! pic.twitter.com/pdta7EpP2k
— Tom Daley (@TomDaley1994) August 9, 2016
Incredibly curious/grossed-out to why the Olympic pool water in the diving competition turned green overnight 😷 pic.twitter.com/tdrHtyMXTp
— Eli Somers (@Brosophocles) August 9, 2016
— Danny Englander (@denglander) August 9, 2016
There is speculation that the color could be caused by algae due to a lack of chlorine, but no one knows for certain yet.
Rio organizers issued a statement saying tests showed the water isn’t harmful for athletes, and that they are still investigating the cause.