RedactedNarrative: On July 6, 2021 at approximately 4:30 PM a Rinker Cabin Cruiser at harbor was reported to be on fire. Chicago Police Department Marine Unit 3 and Chicago Fire Department responded to the fire and attempted to extinguish the vessel. The Chicago Fire Department was unable to extinguish the flames and the vessel sank to the bottom of the harbor causing damage to the dock and several surrounding vessels. At approximately 11:40 AM, I contacted the owner, about the accident. He stated that no one was on the vessel and that he was at home at the time of the fire. A neighboring boat owner sleeping on their vessel near vessel contacted him about the fire and he arrived while Chicago Fire Department was attempting to extinguish the vessel. He confirmed that his family members were all accounted for. At approximately 6:30 PM, Tow Boat U.S. raised the Summer Shack from harbor and confirmed no one was on board the remains of the vessel. The surrounding boats at Slips received soot, smoke, and heat damage from the fire. Watercraft located at slips  reported damage greater then $2000.00.