RedactedNarrative: On July 29, 2017, at approximately 1800hrs.,  I (CPO) was informed via. Chicago Police Marine Unit, of a swimmer who had been struck by a passing boat.  Sgt., CPD Marine Unit and I responded to the south side of Navy Pier where the victim had reportedly relocated from the play pen via. V2.  
  
  We arrived on scene and found victim who had been struck by a passing vessels propeller.  Victim was conscious and talking but had approximately a 12" laceration to his lower right back.  CPD Marine officers rendered aid until Chicago Fire arrived on scene.  Victim was able to stand, climb a ladder and walk to the ambulance.  
  
  I questioned occupants aboard v2 who all stated they didn''t see Victim get hit by the vessel or see the vessel that hit him.  All witnesses stated that Victim was out swimming when he swam over to the boat and climbed in saying he had been hit. 
  
  I meet and spoke with the victim on Aug. 25, 2017, at approximately 1:30pm.  Victim stated that he had been swimming in the Play Pen the day of the incident when a line of approximately 7 boats that were tied together began to back up.  He stated he felt something hit his back so he got out of the water.  He realized that he had been cut by one of the boats but was unsure what boat hit him.  His friend then transported him to Navy Peir where he recieved medical treatment and was transported to the hospital.  Victim stated he recieved stiches in his lower back and was released a few hours after arriving at the hospital.
  
  End Report