Downtown Hudson Tubes

The Downtown Hudson Tubes (formerly the Cortlandt Street Tunnel) are a pair of tunnels that carry PATH trains under the Hudson River in the United States, between New York City to the east and Jersey City, New Jersey, to the west. The tunnels run between the World Trade Center station on the New York side and the Exchange Place station on the New Jersey side. PATH operates two services through the Downtown Tubes, Newark–World Trade Center and Hoboken–World Trade Center. The former normally operates 24/7, while the latter only operates on weekdays.

Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).