Tunnel

A tunnel for car movement in Hamburg, Germany.

A tunnel is an underground passage. Some tunnels are used for cars, and others are used for trains. Sometimes, a tunnel is used for movement of ships. Some tunnels are built for communication cables and some are built for electricity cables. Other tunnels are built for animals.[1]

North portal of Milford railway tunnel, England.

Tunnels are dug in different kinds of grounds, from soft sand to hard rock. The way of digging is chosen by the type of ground. There are two additional ways of digging : quarry and 'cut and cover'. In quarry, the tunnel path is drilled in a horizontal way.This system requires a deep tunnel that's built in a firm rock. In the 'cut and cover' system, a tunnel is dug in the ground and, afterwards, a roof is built above the tunnel. This system fits tunnels that are close to the ground like road tunnels and infrastructure.

Building tunnels is a large civil engineering project that could cost very high sums of money. The planning and building of a long tunnel may take many years.

The Channel Tunnel between France and England is one of the longest tunnels in the world. It is 50 kilometers long. The longest tunnel in the world, the Gotthard Base Tunnel, is being dug in Switzerland.

  • reasons to build a tunnel
  • notes

Reasons to build a tunnel

  • A subway is based on a network of tunnels that are dug underground so the trains will not disturb and will not be disturbed by the local transport.
  • On the path of a railroad track or a road a tunnel is dug when the lane encounters an obstacle such as a mountain to avoid bypassing the obstacle.
  • A tunnel is built sometimes to overcome a water obstacle as a replacement for building a bridge above it.
  • A tunnel is built to connect between military posts so the movement between them will not be visible for the enemy.
  • A tunnel is built for infrastructure like electricity cables, water, communication and sewerage to avoid damage and disruption above ground.
  • Some tunnels are used by prisoners to escape jail.
  • Sometimes tunnels are used by criminals to do a bank robbery (e.g. in Brazil, Summer 2005).
Other Languages
Afrikaans: Tonnel
Alemannisch: Tunnel
العربية: نفق
aragonés: Túnel
asturianu: Túnel
বাংলা: সুড়ঙ্গ
беларуская: Тунэль
беларуская (тарашкевіца)‎: Тунэль
भोजपुरी: सुरंग
български: Тунел
bosanski: Tunel
brezhoneg: Riboul
català: Túnel
čeština: Tunel
dansk: Tunnel
Deutsch: Tunnel
eesti: Tunnel
Ελληνικά: Σήραγγα
English: Tunnel
español: Túnel
Esperanto: Tunelo
euskara: Tunel
فارسی: تونل
français: Tunnel
Gaeilge: Tollán
galego: Túnel
한국어: 터널
հայերեն: Գետնուղի
हिन्दी: सुरंग
hrvatski: Tunel
Ido: Tunelo
Bahasa Indonesia: Terowongan
íslenska: Jarðgöng
עברית: מנהרה
ქართული: გვირაბი
қазақша: Туннель
Kreyòl ayisyen: Tinèl
latviešu: Tunelis
Lëtzebuergesch: Tunnel
lietuvių: Tunelis
magyar: Alagút
македонски: Тунел
മലയാളം: തുരങ്കം
मराठी: भुयार
Bahasa Melayu: Terowong
монгол: Туннел
မြန်မာဘာသာ: ဥမင်
Nederlands: Tunnel
日本語: トンネル
norsk: Tunnel
norsk nynorsk: Tunnel
occitan: Tunèl
олык марий: Тоннель
oʻzbekcha/ўзбекча: Tunnel
português: Túnel
română: Tunel
русский: Тоннель
Scots: Tunnel
slovenčina: Tunel
slovenščina: Predor
کوردی: تونێل
српски / srpski: Тунел
srpskohrvatski / српскохрватски: Tunel
suomi: Tunneli
svenska: Tunnel
తెలుగు: సొరంగం
тоҷикӣ: Ағба
Türkçe: Tünel
українська: Тунель
Tiếng Việt: Hầm (giao thông)
吴语: 隧道
粵語: 隧道
中文: 隧道