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Name The Longest Underground Tunnel In The World?

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A tunnel by definition is an underground passage. While there is still a lot of controvery as to what constitutes a tunnel, generally the ratio of the length to the width of the passage of a tunnel should be at least 2 to 1. A tunnel should also be totally enclosed on all sides, except for the openings.

The Seikan tunnel, which is built in Japan is the longest rail tunnel found in the world. It is in total 53.9 km (33.4 miles) long and has 23.3 km (14.5 miles) under the sea. Once the Gotthard Base tunnel is fully constructed in Switzerland, it will be the longest underground tunnel in the world. The world's longest road tunnel is the Lærdal tunnel in Norway. The exact origins of tunnel building is a debatable topic. The Babylonians, for example had built a tunnel (circa 2180 B.C.) under the Euphrates by means of what we now call the "cut-and-cover" method. The Egyptians constructed tunnels as entrances to tombs.
thanked the writer.
Anonymous
Anonymous commented
The longest Tunnel in the world is in Finland. Helsinki water comes from the lake Päijänne. near Lahti. It is led through a 120 kilometre long rock tunnel which was large enough to fit lorries while it was being built. Of course it is now full of water, since that is it's purpose.
Anonymous
Anonymous commented
THank you for your answer. But I think the longest tunnel is Seikan tunnel, which is built on 1988 and the Gotthard Base tunnel, which is 57 072 m is going to be built in 2010 and it will be the longest tunnel But for now, it is the seikan tunnel which is the longest tunnel in the world

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