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The water of the diving pool at right appears a murky green as the water polo pool at left appears a greener colour than the previous day during a preliminary round match between United States and France in the Maria Lenk Aquatic Center at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Wednesday, Aug. 10, 2016. (AP Photo/Matt Dunham)
The water of the diving pool at right appears a murky green as the water polo pool at left appears a greener colour than the previous day during a preliminary round match between United States and France in the Maria Lenk Aquatic Center at the 2016 Summer Olympics in Rio de Janeiro, Brazil, Wednesday, Aug. 10, 2016. (AP Photo/Matt Dunham)

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    A 2nd Olympic pool in Rio turns green

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A 2nd Olympic pool in Rio turns green

Olympic organizers are investigating after the water in the diving well and the water polo pool mysteriously turned green.

A 2nd Olympic pool in Rio turns green

Olympic organizers are investigating after the water in the diving well and the water polo pool mysteriously turned green.