RedactedNarrative: Vessel #1 was towing a tuber when the engine failed.  They were unable to restart it and water started to flood the boat; another boat, Vessel #2, attempted to offer aid via towing them when the boat started to fill to a critical point and began sinking.  All passengers exited the boat on to Vessel #2 and were taken to shore.  Despite being completely submerged, Vessel #1 was towed to the boat ramp and on to a trailer.