1937+1945+1957 Lincoln Tunnel under Hudson River was the longest underwater vehicular tunnel

(Satellite)

"Center Tube (1937), North Tube (1945), South Tube (1957)" It was 1.5 miles (2.4km) long. [cuny]

The eastern portal is a couple of blocks into Manhattan.

Street View, Aug 2021

West portal.

Street View, Aug 2019

Dea posted a bogus photo

The Lincoln Tunnel (1937)

The Lincoln Tunnel, an engineering marvel connecting Manhattan and New Jersey under the Hudson River, opened in 1937. This ambitious project provided a vital roadway for vehicular traffic, alleviating congestion from ferries and bridges. At the time, it was the longest underwater vehicular tunnel in the world. The tunnel’s construction was a significant feat, and it quickly became a crucial component of the region’s transportation network.

 

New York Memories posted
Lincoln Tunnel in New York City in 1939

Edward Harrison: That's not NYC. That's in Weehawken, NJ.

[This single tube became the center tube.]

Keith Schaffler commented on Dea's post
Not the Lincoln Tunnel. Here's a pic of the Manhattan side entrances.

Craig Kennedy commented on Dea's post, cropped
OK looks nothing like the Lincoln Tunnel, but thanks AI!

 

LivingNewDeal_14, National Archives and Records Administration, Neg. P-502

LivingNewDeal_16, National Archives and Records Administration, Neg. P-278

panynj
A shield was used to construct the tunnel. Each ring weighed 21 tons. The workers had to go through a series of air locks, but no source mentioned how many air locks or how long it took to get through all of them.

The ventilation Towers on the west side of the river.

Street View, Mar 2023