The Gotthard Base Rail Tunnel, completed on October 15, 2010, stretches 35.4 miles (about 57 kilometers) under the Swiss Alpine mountains. Its completion pushed the Seikan Tunnel in Japan, at 33.5 miles (about 54 kilometers), to second place. The Gotthard Base Rail Tunnel connects northern Europe to Italy and will shorten the travel time by over an hour when it opens for cargo and passenger trains in 2017. It was a ten billion dollar project that was first conceived about 60 years ago. It took 23 years of digging and the loss of 8 lives for the tunnel to be completed.
At mt. Vernon.
Tunnels are underground passages that are completely enclosed except for the entrance and exit. The longest road tunnel in the world is the Laerdal Tunnel, running over 80,000 feet. The fifth longest is the Hsuehshan Road Tunnel extending over 43,000 feet.
The world's longest canal tunnel is the Rove Tunnel in France. The Stad Ship Tunnel in Norway is shorter, wider, and deeper.
The world's longest railroad tunnel is the Seikan Tunnel, it is 33.49 miles long.
The longest rock tunnel in the world is located in the New York City.
World's longest tunnel situated in New York state, United States named Delaware Aqueduct tunnel
The world's longest canal that is also a tunnel is the Rove tunnel located in France. It was built in 1974. The longest tunnel in the world is a railroad tunnel that is 35 miles long through the Swiss Alps.
The Seikan Tunnel is in japan. it is one of the longest in the world.
Kallang-Paya Lebar Expressway (KPE) in Singapore with about 8.5 kilometres underground.
The tunnel between East Finchley and Morden (via Bank) is the Underground's longest and one of the longest rail tunnels in the world, 27.8km (17.25 miles). However, Morden is covered by a canopy and is therefore tru to your question but East Finchley is not. The previous station to East Finchley is Highgate, approximately 1200 metres from East Finchley.
The longest road tunnel in the world at 24.51 km (15.23 miles) long, is known as the Lærdal Tunnel and is located in Norway!
Jawahar tunnel in j&k india