Vessel 1 was tied up to Vessel 2 while parties aboard both vessels watched the air show.  Vessel 1 was attached to Vessel 2 about 8-10 feet behind the starboard rear cleat of Vessel 2 with a 3/4 inch polypropelene rope with hooks and spring clips on each end of the rope.  One end of the the line was attached to the rear cleat of Vessel 2 and the other end to the bow eye on Vessel 1.  Following the air show, the Operator of Vessel 1 stayed aboard Vessel 2 and Vessel 1 was towed behind Vessel 2.  Several hours later, the Occupants of Vessel 2 observed that Vessel 1 was no longer attached and that the rope end attached to Vessel 1 had unraveled or come apart where the hook was woven on.  Despite searching the area, Vessel 1 was not located (and has not been located to date).
Cleveland                     