Authorities are still investigating how an empty car ended up in Rend Lake. Police say the owner of the vehicle did not know it was missing until authorities notified him. Police are investigating who took the car and how it ended up in the water. Local fisherman found an empty car underwater near a boat ramp at Rend Lake. The car was found at 7.a.m. on Christmas morning near Rend Lake’s west dam. Fire and rescue teams from Franklin County responded to the scene and pulled the vehicle from the water.