What are the biggest tunnels in the world?

1 – Lærdal, Norway, between Lærdal and Aurland: measuring 24.51 kilometres in length, built in 2000. 2 – Yamate Tunnel, Japan, in Tokyo: measuring 18.2 kilometres in length, built in 2015. 3 – Zhongnanshan Tunnel, China, in Shaanxi: measuring 18.04 kilometres in length, built in 2017.



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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.

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The longest tunnel in the United Kingdom is the Northern line at 27,800 metres (91,200 ft). This will be superseded in the 2020s by the 37,600-metre (123,400 ft) Woodsmith Mine Tunnel in North Yorkshire that will transport polyhalite from North Yorkshire to a port on Teesside.

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Fritchley Tunnel is a disused railway tunnel at Fritchley in Derbyshire, England, which is believed to be the oldest surviving example in the world.

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The Channel Tunnel is 31.5 miles long or 50.45 km. That's the equivalent of 169 Eiffel Towers stacked on top of each other. 23.5 miles (37.9 km) of the Channel Tunnel is under the English Channel, making it the world's longest undersea tunnel.

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Seikan Tunnel, Japan Construction 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.

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The Seikan Tunnel (Japanese: ??????, Seikan Tonneru or ????, Seikan Zuido) is a 53.85 km (33.46 mi) dual-gauge railway tunnel in Japan, with a 23.3 km (14.5 mi) portion under the seabed of the Tsugaru Strait, which separates Aomori Prefecture on the main Japanese island of Honshu from the northern island of Hokkaido.

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The world's longest underway highway tunnel is Norway's 14.3-kilometer twin-road Ryfast tunnel, which runs between the city of Stavanger and the municipality of Strand. The underwater tunnel portion of the Tokyo Bay Aqua-Line, a vehicle highway that travels under Tokyo Bay, is 9.6 kilometers.

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High Speed 1 trains travel at up to 300 km/h (186 mph), the journey from London to Paris taking 2 hours 15 minutes, to Brussels 1 hour 51 minutes. In 1994, the American Society of Civil Engineers elected the tunnel as one of the seven modern Wonders of the World.

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How deep is the Channel Tunnel? At its deepest, the tunnel is 75 metres (246 feet) below the sea level. That's the same as 107 baguettes balancing on top of each other.

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