Many people highlighted the problems with the water outdoors in Rio leading up to the 2016 Summer Olympics.

On Tuesday,The Devil in Miss Jonas (Der Teufel in Miss Jonas) the attention quickly turned to the water in the diving pool, which seemed to change from a cool blue to a slime green overnight.

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Among the people to notice was diver Tom Daley from Great Britain, who tweeted a photo of the stadium Tuesday afternoon.

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BBC Sports journalist Nick Hope tweeted a statement saying that venue officials had tested the water and there was "no risk" to athletes' health.

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However, the release also stated that officials were "investigating the cause of the situation."

Photos from Monday clearly show that the diving pool was a very different color.

Original image replaced with Mashable logoOriginal image has been replaced. Credit: Mashable

And if you take a look at the water polo pool located directly next to the diving pool at the Maria Lenk Aquatics Center, clearly, something is wrong.

Mashable ImageRIO DE JANEIRO, BRAZIL - AUGUST 09: General view of the diving pool at Maria Lenk Aquatics Centre on Day 4 of the Rio 2016 Olympic Games at Maria Lenk Aquatics Centre on August 9, 2016 in Rio de Janeiro, Brazil. Credit: Getty Images Mashable ImageRIO DE JANEIRO, BRAZIL - AUGUST 09: General view of the diving pool at Maria Lenk Aquatics Centre on Day 4 of the Rio 2016 Olympic Games on August 9, 2016 in Rio de Janeiro, Brazil. Credit: Getty Images

After people started to notice the color conundrum, the hashtag #greenpool started to pick up on Twitter.