The Second Avenue Subway (officially the IND Second Avenue Line; abbreviated to SAS) is a long-envisioned rapid transit subway line, part of the New York City Subway system. As of 2014, Phase I, a new line between the existing BMT 63rd Street Line and 96th Street and Second Avenue, is under construction beneath Second Avenue in the borough of Manhattan. This first phase is scheduled to be opened on December 30, 2016, and will serve approximately 200,000 daily riders when open. When the whole line is completed, which MTA Capital Construction President Dr. Michael Horodniceanu says may be as early as 2029, it is projected to serve about 560,000 daily riders.