Officials at the 2016 Olympics have explained why the water in the diving pool appears discoloured.
Rio spokesperson Mario Andrada told USA Today that the pool had a green tint due to a build-up of algae.
Swimming's governing body FINA has also addressed the discolouration and released a statement confirming that tests have proven the water poses no health risks to the athletes.
"FINA can confirm that the reason for the unusual water colour observed during the Rio 2016 diving competitions is that the water tanks ran out some of the chemicals used in the water treatment process. As a result the pH level of the water was outside the usual range, causing the discoloration," said the organisation in a statement.
"The FINA Sport Medicine Committee conducted tests on the water quality and concluded that there was no risk to the health and safety of the athletes, and no reason for the competition to be affected."
Andrada went on to say that water "will be blue from now on", ahead of today's men's 3m synchronised springboard final.
