Two people are believed drowned over the holiday weekend at Rock Island State Park with search and rescue personnel still looking for one of the missing men.The still-missing victim, identified only as a 55-year-old Nashville man, continued to be the point of a massive search by rescue teams Tuesday, three days after he disappeared while swimming with his son on Saturday. Investigators with the White County Sheriff’s Department have not released the victim’s name since he remains missing.According to reports, the victim was swimming near an area known as Twin Falls in the vicinity of the power house when he was knocked off his feet by fast-moving water and was swept downstream out of sight of his son. The area where the two were swimming is posted as off limits for swimmers due to swift currents.Members of several rescue organizations, including the Warren County Rescue Squad, have continued dragging operations since the disappearance.Boats were in the water looking for the Nashville man the following day when an alert was issued for another missing swimmer, this time down river toward the Sand Bar area of the park.