In the mid-1800s, the United States built the first subway tunnel in a city that had never been built before, but it wasn’t until the mid 20th century that the subway began to take shape.

In the 1920s, construction of the first U.S. subway started, and the first subways began operating in New York City in 1935.

In 1960, the last of the original four tunnels under the Hudson River opened, but the subway wasn’t built until 1966.

In 2020, construction started on the second, larger, tunnel under the New Jersey shoreline.

It’s not a huge leap, but its still a massive undertaking.

A total of 6,000 people died during construction, and there were also many serious injuries during the tunnel’s construction. 

There were also some problems with the construction of this second tunnel.

 First, when the tunnel was completed, the entire southern half of the Hudson was still under construction.

The construction of that second tunnel took a little longer than the first, and was completed in three different sections — New Jersey, Connecticut, and New York.

Second, the tunnel itself had a number of problems that meant the first section of the tunnel wasn’t always fully complete.

The tunnel was so full of concrete that a portion of the south end of the subway was covered in graffiti and graffiti had to be removed from the tunnel to allow the tunnel section to be completed. 

Finally, while the tunnel is completed, a portion has been removed.

It took the work of the NYPD, the Port Authority of New York and New Jersey and the U.K.’s Metropolitan Police Department a total of 2.6 million pounds of concrete to build the tunnel.

That means the total cost of the entire tunnel project was more than $5 billion dollars. 

Despite the construction delays, there were some positives to the second tunnel, too.

The tunnel section was so deep, and so wide, that it was able to withstand hurricanes, earthquakes, and tornadoes.

And in 2020, a new subway tunnel was also built, so there’s a lot of work to be done.

Read more:   New York City tunnel workers are going to have to dig it out