Divers were forced to compete in water the colour sea lions - rather than Olympians - are accustomed to performing in.
Questions were asked on social media. Had Shrek taken an overnight dip? Was it because Roald Dahl's BFG had been drinking frobscottle?
On Monday, Tom Daley and Daniel Goodfellow had won bronze in then picture-perfect conditions and even Daley did not know what had happened to the clear water he had dived into just 24 hours earlier.
At the Aquatics Centre, Pedro Adrega, head of communications at Fina, swimming's governing body, was flabbergasted, suggesting athletes had perhaps requested for the colour change to lessen the effects of the sun's glare.
Inside the press room, American photographers chatted about the possibility that the water had not been treated properly overnight, causing a drop in chlorine levels and the formation of algae.
Inside the press room, American photographers chatted about the possibility that the water had not been treated properly overnight, causing a drop in chlorine levels and the formation of algae.
