RedactedNarrative: Vessel 1 was in operation, heading roughly southeast inside of the Cleveland Breakwall west of the Cuyahoga River at an estimated speed of 5-10 knots.  Vessel 1 was estimated to be three-quarters of the way between the shore and the breakwall when Vessel 1 passed a mooring buoy estimated to be 20 yards off the port side of Vessel 1.  The buoy had a light, but the light was not on.  At the same time that the Operator of Vessel 1 noticed the buoy, a hawser attached to the buoy became entangled around the port propeller and drive shaft of Vessel 1.  The Operator immediately stopped Vessel 1, but was unable to free the lines from Vessel 1.  A short time later the Operator observed that Vessel 1 was beginning to ride lower in the water.  All of the persons on board donned life jackets at this time and contacted emergency services via cell phone.  The Coast Guard responded to the scene, brought all parties aboard Vessel 1 onto the Coast Guard vessel, and attempted to de-water Vessel1.  Vessel 1 was later towed to a slip at the marina where it came to rest approximately three-quarters submerged.