In the fourth day of the search on Lake Lanier for Griffin Prince, crews began using a robot with cameras and lights that can search the deepest areas of the lake. Prince, 13, has been missing since a Monday night boating accident that killed his 9-year-old brother, Jake, in the area of Shoal Creek near Buford Dam. Capt. Robert Estrada with Tow Boat US described the remote-operated vessel as a “mini submarine on a tether.”