This report summarizes a single vessel missing person accident. on 9/5/23 at approximately 0825 hours on a boat, two passengers left the vessel to swim in Lake Michigan. Subject1 stated that Subject2 went under the water after approximately two minutes of swimming. Subject1 was treading water for  approximately 20 minutes before being able to get onboard the boat. Operator was unaware that the two passengers voluntarily left the boat to swim. The boat was not anchored and was drifting at the time of
Subject2's disappearance. As of 1230 hours on 9/6/2023 Subject2 has yet to be recovered or located

Lake Michigan
Chicago                       