SYLVANIA - Two hidden rooms, 40 marijuana plants, and 10 different varieties were discovered on Halcyondale Road in what Screven County Sheriff's investigators are calling "one of the most sophisticated indoor marijuana grows seized in the last 10 years." During the execution of a search warrant earlier this month in Sylvania at 1316 Halcyondale Road, Michael William Royal, 43, and his girlfriend Julie Ann Rauch, 39, were arrested and charged with one count of manufacturing marijuana after their indoor operation was uncovered, investigators said. While investigators suspected drug activity, they did not expect to find such an elaborate and sophisticated manufacturing operation, said Inv.