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Olympic diving pool mysteriously turns green

<p>Mexico's duet Paola Espinosa and Alejandra Orozco compete in the Women's Synchronised 10m Platform Final during the diving event at the Rio 2016 Olympic Games at the Maria Lenk Aquatics Stadium(Photo credit should read MARTIN BUREAU/AFP/Getty Images)</p>

When everyone went to bed Monday night in Rio de Janeiro, the Olympic diving pool was a nice shade of blue.

When everyone started piling in Maria Lenk Aquatics Stadium venue Tuesday, the pool was a gross shade of green.

PHOTOS | Olympic diving pool turns bright green

The worst part, no one knows why.

Right next to it is the water polo pool, which still looks perfect.

According to some fancy Google searches, pool water can turn green when the chlorine level falls below a certain point.

Likely the pool staff needs to add some chemicals to the pool because the green color is usually because of algae growing in the water. However, they say they tested it and found nothing wrong with it.

It doesn't seem to be concerning too many of the swimmers. They are still diving right in.

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