The picture above shows the dramatic change in colouration in the space of just 24 hours.
The strange incident prompted Tom Daley, who won bronze in Monday’s men’s 10m synchronised diving alongside Dan Goodfellow, to tweet his confusion:
Officials did not explain why the water had turned such a murky shade but Twitter users had their own theories.
These ranged from the plausible...
To the revolting...
Some suggested sun cream was the culprit...
While others posited that it could be a prank...
Whatever the reason, the mystery has utterly gripped Olympics fans...
Team GB divers Tonia Couch and Lois Toulson were among those to plunge into the murky depths for the women’s synchronised 10m platform event.
The pair, who missed out on a medal after an error in their final dive and finished fifth, admitted they could not see each other under the water.
Couch said: “It’s so green. But, we got a personal best score, so maybe we should ask for a green pool from now on. I kind of liked it.
“As the sun went down it looked worse.
“I couldn’t see you when I was underneath. I was like ‘Lois, where are you?’”
Toulson added: “We can’t do anything about it, so just concentrate on what you’re doing.”
According to The Times’ chief sports reporter Martyn Ziegler, no explanation was offered by officials.
The official organising committee echoed this:
The men’s 3m synchronised springboard event takes place at the pool this evening, so it will be interesting to see what colour the water is on day five.