A ceremonial ground-breaking for the Second Avenue Subway was held on April 12, 2007. The first phase of the line, consisting of three newly-built stations and two miles (3.2 km) of tunnel, cost $4.45 billion. A 1.5-mile (2.4 km), $6 billion second phase is in planning and is expected to open by 2027–2029.
Construction on the Second Avenue Line started in 1972 as part of the earlier Program for Action, but was halted in 1975 because of the city's fiscal crisis, with only a few short segments of tunnels having been completed. Construction work on the 63rd Street Lines, which would connect the Second Avenue Line and the IND Queens Boulevard Line to the BMT Broadway Line and the IND Sixth Avenue Line, had started in 1969, and work on the 63rd Street Lines continued even after construction on the Second Avenue line ended. The first segment of the 63rd Street Lines, which opened in October 1989, included provisions for future connections to the Second Avenue Line.