RedactedNarrative: The operator was using the watercraft for the first time. He had limited watercraft experience. He was cruising at low speed when he throttled up the motor. The boat began to shake and the motor fell off the boat, damaging the transom. 2/3 of the boat was under water. The 8 occupants went into the water and were rescued by a passerby on a pontoon boat. Life jackets were being worn at the time of the incident. There were no injuries. Alcohol was not a factor. The cause of the damage was overloading and the age/structure of the boat. The boat is a Total Loss.