How did they build the tunnel under the Hudson River?

Construction started simultaneously on both sides of the river. Precise measurements ensured that each tube lined up perfectly to meet in the middle. Tunnel workers (affectionately known as 'sandhogs') dug through the mud by pneumatically pushing cylindrical shields through the river bottom.



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Also known as the Cobble Hill tunnel, the half-mile Atlantic Avenue tunnel is not only the oldest subway tunnel in NYC but also the world. Running beneath Brooklyn's Atlantic Avenue, it was first built in 1844 and was sealed off in 1861.

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“Its skeletal structure is made up of hundreds of massive 21-ton iron rings that were bolted together. In addition, the interior of the rings is encased in concrete, thereby sealing out the Hudson River.”

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Lincoln Tunnel No trucks permitted in the center tube. Motorized vehicles only. No pedestrian or bicycle access. Operators of overweight or over-dimensional cargo, or to lead a convoy across the Lincoln Tunnel, must contact the 24-hour Communications Desk at (201) 617-8115 prior to their trip for approval.

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“The first infrastructures of this type were built at the end of the 19th century, and at present there are nearly 200 underwater tunnels built worldwide. Although some are used for water and electricity supply, most are used to house road or rail connections.

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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.

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One way around that problem is for the wrecker to pump enough air pressure to release the brakes of the disabled vehicle. Then it can be towed out with a chain, he said. A bridge and tunnel agent will be inside a disabled bus to make sure it's under proper control, he said.

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The tunnel does leak, but it is designed to. Seawater from the rocks above the tunnel drips through and is then pumped away.

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There are subway lines that run under the water, via tunnels constructed through the ground beneath the water, but there are no lines running through the water. There are 14 underwater crossings the NYC subway does.

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Because of this, the high costs of the potential tunnel, and the relatively small population of Staten Island, the Manhattan route was considered impractical. Another 5-mile tunnel to Battery Park was proposed by the city in the 1950s, but the plan was scrapped due to a lack of funding.

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Technically called “Tunnel Street,” the three-block-long passage is the city's only underground street, according to 6sqft. It serves as a Broadway entrance to the 191st Street subway station, which, at 175 feet underground, is the deepest in the system.

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