Vessel swamped with water and partially sank. According to those involved, the vessel was not moving at the time that waves began splashing over the transom. Passengers were getting ready to begin tubing and were untangling the rope when the vessel swamped with water and began to sink. The vessel  was  buoyant enough fo the nose to remain above the water, so the operator and the juvenile passengers swam to the vessel to the nearest shore and tied it to a tree. Officer found the party in this condition and towed the partially capsized vessel and occupants to a nearby boat ramp to be picked up by the corps of engineers. Operator stated that he had opertated the vessel without a problem all weekend, but had installed a hydrofoil stabilizer on the outboard right before the accident occured. There were no visible holes in the hull and the plug was still in place after the vessel was towed to the boat ramp. Alcohol was not involve. Pfd's were being worn by two persons on board, and one as a result of the accident.
WAS                           