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[7] [8] The portals of each tube contain flood doors weighing 20 short tons (18 long tons; 18 t) and measuring 2 feet (0.61 m) thick, 14 feet (4.3 m) across, and 29 feet (8.8 m) tall. [9] The tunnel was originally commissioned by the New York City Tunnel Authority, whose chief engineer Ole Singstad created the tunnel's original designs.