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

On Tuesday, the attention quickly turned to the water in the diving pool, which seemed to change from a cool blue to a slime green overnight.

SEE ALSO:Rio Olympics: What's up with all those empty seats?

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."

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

Diving - Men's Synchronised 10m Platform Final. Tom Daley and Daniel Goodfellow of Great Britain win bronze Rio 2016 Olympic Games Day 3, Rio de Janeiro, Brazil  Aug 8, 2016Credit: AP

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.

RIO 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 ImagesRIO 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.

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TopicsOlympics