Something in the water at the Rio Olympics has caused two outdoor pools to turn green. While officials have maintained that there is no risk associated with the unsettling color, the diving pool was closed on Friday morning.

British diver Tom Daley tweeted the news and expressed concern over the fact that he and other athletes had been swimming in the green water.

http://www.msn.com/en-us/sports/olympics/diving-pool-in-rio-closed-due-to-green-water/ar-BBvyvQ9?li=BBu4ILf&srcref=rss&ocid=iehrs