You're soaking in it. Rio's murky green pool confuses experts

Divers at the Rio Olympics arrived at the pool on Tuesday to find the water a deep shade of green, in stark contrast to the aqua blue colour that filled the aquatic centre less than 24 hours before.

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The water yesterday vs today. Photos: Getty/Reuters

Amateur pool quality detectives have theorized that the chlorine balance in the pool is out of whack, allowing algae to form in the water. The solution is “shocking” the pool with a cocktail of specific chemicals, something that’s a matter of routine when talking about your neighborhood pool but a bit more complex with the most viewed aquatic center on the entire planet.

Athletes have continued diving into the green water anyway, even though we’re clearly talking about far nastier, or at least cloudier, water:

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The women's 10m synchronised platform competition took place with athletes plunging into a murky green diving well that contrasted sharply with the normal light-blue of the adjacent water-polo pool.

Olympic officials said they were investigating the cause.

"Water tests at Maria Lenk Aquatics Centre?s diving pool were conducted and there was found to be no risk whatsoever to athlete?s health," said Simon Langford, the venue's media manager.

"We are investigating to determine what the cause of the situation was, but we are happy to report that the competition was successfully concluded."

He declined further comment.

Brazil's hosting of the games already has seen a number of organisational snafus including flawed Chinese flags at official ceremonies, complaints about huge queues, Olympics transport chaos and a wave of thefts.

Divers prepare to jump into the green water in the aquatic center in Rio. Photo: Getty

British diving star Tom Daley, who won bronze in the men's 10m synchro on Monday, tweeted a photo of the aquatics centre scene, with the difference between the two pools clearly visible.

"Ermmm... what happened?!" he added.

But competitors in Tuesday's event shrugged it off, saying it had no impact on them or their performances.

"I thinks pretty normal for an outdoor pool, so it wasn?t a big deal for us," said Pandelela Rinong, who won silver for Malaysia along with Cheong Jun Hoong.

The water had been a normal colour on the first two days of diving.