The twin lane East River Mountain Tunnel is 5,400 feet long and the Big Walker Mountain Tunnel, also twin lanes, is more than 4,200 feet in length. Changing lanes is permitted in both tunnels.
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The tubes descend 91 to 95 feet (28 to 29 m) below the mean high water level of the East River, with a maximum gradient of 3.1 percent. During the tunnel's construction, a house at 58 Joralemon Street in Brooklyn was converted into a ventilation building and emergency exit.
The East River Tunnel (ERT) consists of four tubes connecting New York City to destinations east, and is used by Amtrak, Long Island Rail Road (LIRR), and NJ TRANSIT trains.
Fehmarnbelt Tunnel: The longest underwater rail and road tunnel in the world will connect Germany and Denmark. An 18-kilometer underwater tunnel will soon connect Germany and Denmark.
The Eiksund road tunnel in Norway connects the Norwegian mainland with Hareidlandet island. The tunnel is 7,765 metres (25,476 feet) long and achieves a depth below sea level of 287 metres (942 feet).
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.
The Apennine Base Tunnel, alternatively known as the Grand Apennine Tunnel, is a railway base tunnel 18.507 kilometres (11.500 mi) long on the Bologna-Florence Direttissima line in central Italy.
1. -The Laerdal tunnel. With its 24.5 kilometers, Laerdal tunnel is the longest in the world, traversing several mountainous formations between Laerdal and Aurland, in western Norway.
Simplon Tunnel, railway tunnel from Iselle, Italy, to Brig, Switzerland, one of the longest railway tunnels in the world and one of history's great engineering feats. Running about 20 km (12.5 miles) long, it was the largest of the great Alpine tunnels when it opened to traffic in 1906.
Longest motorway tunnels: the Frejus Tunnel in first place in Italy. The longest motorway tunnel in Italy is located under the Alps, on the border with France, connecting Bardonecchia in Val di Susa, and Modane, in the French Savoy.
Seikan Tunnel, JapanConstruction of the Seikan tunnel experienced many technical challenges as the infrastructure sits through an earthquake-prone zone. The engineers couldn't use tunnel boring machines (TBM) as the rock and soil underneath the Tsugaru Strait was arbitrarily unpredictable.