Stretching 8,557 feet (2,608 m) from portal to portal in the North Tube and 8,371 feet (2,551 m) in the South Tube, the Holland Tunnel cost $48.5 million to build and the expenses were equally shared by states of New York and New Jersey.
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It is about 1.5 miles (2.4 km) long and lies 97 feet (30 metres) below the river's surface. The central tube was the first to open, in 1937, and has reversible traffic lanes; it is the longest of the three tubes, 8,216 feet (2,504 metres).
Tunnel workers (affectionately known as 'sandhogs') dug through the mud by pneumatically pushing cylindrical shields through the river bottom. Those shields held back the earth, making way for construction of the thick tunnel walls, built of cast iron rings filled with concrete.
The three tunnels are: New York City Water Tunnel No. 1, completed in 1917. It runs from the Hillview Reservoir under the central Bronx, Harlem River, West Side, Midtown, and Lower East Side of Manhattan, and under the East River to Brooklyn where it connects to Tunnel 2.
The Holland Tunnel is a vehicular tunnel under the Hudson River that connects Hudson Square and Lower Manhattan in New York City in the east to Jersey City, New Jersey in the west.
How long is the Channel Tunnel? The Channel Tunnel is 31.5 miles long or 50.45 km. That's the equivalent of 169 Eiffel Towers stacked on top of each other. 23.5 miles (37.9 km) of the Channel Tunnel is under the English Channel, making it the world's longest undersea tunnel.
The Laerdal Tunnel in western Norway is the longest road tunnel in the world. It takes about 20 minutes to pass through the tunnel. Brightly colored lights placed every six kilometers help drivers stay alert.
Necessary repairs and permanent resiliency improvements are being implemented at the Holland Tunnel as part of the Holland Tunnel Sandy Repairs and Resiliency Improvements project. To accommodate this work, overnight closures will be required, Sunday through Friday, until the end of 2025.