A new Subway restaurant under construction on the corner of Victoria Ave and Liffey St. The fast food outlet will be the fourth Subway in Invercargill, but it will have a point of difference — a drive-through. ‘‘It will be the first Subway with a drive-through south of Dunedin,’’ franchisee Richard Jackson said. The restaurant, expected to employ about 20 staff, was expected to open within the next couple of months, he said. He and his wife Paula also own the Subway restaurant in Windsor, which opened in 2013, and another in Balclutha.