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The 53.85km Seikan tunnel in Japan is the longest and deepest rail tunnel in the world. It passes through Tsugaru Strait connecting the Hokkaido and Honshu islands.
The 50.5km long Channel tunnel, located on the English Channel in the UK and France borders, is the longest undersea rail tunnel in the world. It connects Folkestone in Kent, UK, to Coquelles in Pas-de-Calais, France. The tunnel was opened for operations in 1994 after nearly six years of construction and cost $14.7bn. It recently won the Global Engineering 'Century Award' by the international federation of civil engineering consultants, FIDIC.
Measuring 57 km in length, situated 2.3km deep under the Alps and having cost €11bn to complete, Switzerland’s Gotthard base tunnel is more than just the world’s longest and most expensive tunnelling project. The journey time between Zurich and Lugano will be reduced by 45 minutes to just less than 2 hours.
The Pir Panjal Tunnel is a long under construction railway tunnel at the Pir Panjal Range of Himalayas in the state of Jammu and Kashmir. The 11.00 km long Banihal railway tunnel will be India’s longest railway tunnel and and Asia’s 2nd longest railway tunnel. The great tunnel is located on the highest mountain pass on the eastern Pir Panjal range in middle of Himalayas. Indian Railways is closer to finish the work on India’s longest transportation railway tunnel. The longest tunnel of India is successfully passing its train trial run through Pir Panjal tunnel