Scuba divers retrieved a man from the South Branch of the Chicago River near the Cermak Road overpass early Sunday, Sept. 3, 2017, in Chicago. He was transported in critical condition to Mercy Hospital. (John J. Kim / Chicago Tribune)

Scuba divers retrieved a man from the South Branch of the Chicago River near the Cermak Road overpass early Sunday, Sept. 3, 2017, in Chicago. He was transported in critical condition to Mercy Hospital. (John J. Kim / Chicago Tribune)

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