British diver Tom Daley has put the mystery surrounding the green water at the Maria Lenk Aquatics Centre back in the spotlight after revealing the venue was closed on Friday.
It has been one of the strangest stories of Rio 2016, with divers forced to compete in a pool that more closely resembled a pond.
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The International Swimming Federation said a chemical imbalance caused the issue that also affected the water polo arena. A spokesman for the IOC insisted that the green water didn't put the athletes at risk, but the decision to close the pool today could reignite concerns.