The Staten Island Tunnel is an abandoned, incomplete railway and subway tunnel in Staten Island, New York City. It was intended to connect railways on Staten Island (precursors to the modern-day Staten Island Railway) to the BMT Fourth Avenue Line of the New York City Subway, in Brooklyn, via a new crossing under the Narrows. Planned to extend 10,400 feet (3,200 m), the tunnel would have been among the world's longest at the time of its planning, in the late 19th and early 20th centuries.
Construction began in 1923, and the tunnel was excavated 150 feet (46 m) into the Narrows before New York City Mayor John Hylan, a former Brooklyn–Manhattan Transit Corporation (BMT) employee and initial proponent of the tunnel, canceled the project in 1925. The tunnel lies dormant under Owl's Head Park in Bay Ridge, Brooklyn. Later proposals to complete the tunnel, including the 1939 plans for the Independent Subway System's ambitious Second System, were never funded.
