This article is about underground passages. For other uses, see Tunnel (disambiguation).
"Underpass" redirects here. For the John Foxx song, see Underpass (song). For a tunnel for pedestrians, see Pedestrian underpass.
Decorated entrance to a road tunnel in Guanajuato, Mexico
Utility tunnel for heating pipes between Rigshospitalet and Amagerværket in Copenhagen, Denmark
Tunnel on the Taipei Metro in Taiwan
Southern portal of the 421 m long (1,381 ft) Chirk canal tunnel

A tunnel is an underground or underwater passageway, dug through the surrounding soil/earth/rock and enclosed except for entrance and exit, commonly at each end. A pipeline is not a tunnel, though some recent tunnels have used immersed tube construction techniques rather than traditional tunnel boring methods.

A tunnel may be for foot or vehicular road traffic, for rail traffic, or for a canal. The central portions of a rapid transit network are usually in tunnel. Some tunnels are aqueducts to supply water for consumption or for hydroelectric stations or are sewers. Utility tunnels are used for routing steam, chilled water, electrical power or telecommunication cables, as well as connecting buildings for convenient passage of people and equipment.

Secret tunnels are built for military purposes, or by civilians for smuggling of weapons, contraband, or people. Special tunnels, such as wildlife crossings, are built to allow wildlife to cross human-made barriers safely.


A tunnel is relatively long and narrow; the length is often much greater than twice the diameter, although similar shorter excavations can be constructed, such as cross passages between tunnels.

The definition of what constitutes a tunnel can vary widely from source to source. For example, the definition of a road tunnel in the United Kingdom is defined as "a subsurface highway structure enclosed for a length of 150 metres (490 ft) or more."[1] In the United States, the NFPA definition of a tunnel is "An underground structure with a design length greater than 23 m (75 ft) and a diameter greater than 1,800 millimetres (5.9 ft)."[2]

In the UK, a pedestrian, cycle or animal tunnel beneath a road or railway is called a subway, while an underground railway system is differently named in different cities, the "Underground" or the "Tube" in London, the "Subway" in Glasgow, and the "Metro" in Newcastle. The place where a road, railway, canal or watercourse passes under a footpath, cycleway, or another road or railway is most commonly called a bridge or, if passing under a canal, an aqueduct. Where it is important to stress that it is passing underneath, it may be called an underpass, though the official term when passing under a railway is an underbridge. A longer underpass containing a road, canal or railway is normally called a "tunnel", whether or not it passes under another item of infrastructure. An underpass of any length under a river is also usually called a "tunnel", whatever mode of transport it is for.

In the US, the term "subway" means an underground rapid transit system, and the term pedestrian underpass is used for a passage beneath a barrier. Rail station platforms may be connected by pedestrian tunnels or footbridges.


Joralemon Street Tunnel in 1913, part of the New York City Subway system

Much of the early technology of tunneling evolved from mining and military engineering. The etymology of the terms "mining" (for mineral extraction or for siege attacks), "military engineering", and "civil engineering" reveals these deep historic connections.

Geotechnical investigation and design

A major tunnel project must start with a comprehensive investigation of ground conditions by collecting samples from boreholes and by other geophysical techniques. An informed choice can then be made of machinery and methods for excavation and ground support, which will reduce the risk of encountering unforeseen ground conditions. In planning the route, the horizontal and vertical alignments can be selected to make use of the best ground and water conditions. It is common practice to locate a tunnel deeper than otherwise would be required, in order to excavate through solid rock or other material that is easier to support during construction.

Conventional desk and preliminary site studies may yield insufficient information to assess such factors as the blocky nature of rocks, the exact location of fault zones, or the stand-up times of softer ground. This may be a particular concern in large-diameter tunnels. To give more information, a pilot tunnel (or "drift tunnel") may be driven ahead of the main excavation. This smaller tunnel is less likely to collapse catastrophically should unexpected conditions be met, and it can be incorporated into the final tunnel or used as a backup or emergency escape passage. Alternatively, horizontal boreholes may sometimes be drilled ahead of the advancing tunnel face.

Other key geotechnical factors:

Choice of tunnels vs. bridges

The Harbor Tunnel in Baltimore, which carries I-95, serves as an example of a water-crossing tunnel built instead of a bridge.

For water crossings, a tunnel is generally more costly to construct than a bridge. However, navigational considerations may limit the use of high bridges or drawbridge spans intersecting with shipping channels, necessitating a tunnel.

Bridges usually require a larger footprint on each shore than tunnels. In areas with expensive real estate, such as Manhattan and urban Hong Kong, this is a strong factor in favor of a tunnel. Boston's Big Dig project replaced elevated roadways with a tunnel system to increase traffic capacity, hide traffic, reclaim land, redecorate, and reunite the city with the waterfront.

The 1934 Queensway Tunnel under the River Mersey at Liverpool was chosen over a massively high bridge for defense reasons; it was feared that aircraft could destroy a bridge in times of war. Maintenance costs of a massive bridge to allow the world's largest ships to navigate under were considered higher than for a tunnel. Similar conclusions were reached for the 1971 Kingsway Tunnel under the Mersey. In Hampton Roads, Virginia, tunnels were chosen over bridges for strategic considerations; in the event of damage, bridges would prevent US Navy vessels from leaving Naval Station Norfolk.

Water-crossing tunnels built instead of bridges include the Holland Tunnel and Lincoln Tunnel between New Jersey and Manhattan in New York City; the Queens-Midtown Tunnel between Manhattan and the borough of Queens on Long Island; the Detroit-Windsor Tunnel between Michigan and Ontario; and the Elizabeth River tunnels between Norfolk and Portsmouth, Virginia; the 1934 River Mersey road Queensway Tunnel; the Western Scheldt Tunnel, Zeeland, Netherlands; and the North Shore Connector tunnel in Pittsburgh, Pennsylvania.

Other reasons for choosing a tunnel instead of a bridge include avoiding difficulties with tides, weather, and shipping during construction (as in the 51.5-kilometre or 32.0-mile Channel Tunnel), aesthetic reasons (preserving the above-ground view, landscape, and scenery), and also for weight capacity reasons (it may be more feasible to build a tunnel than a sufficiently strong bridge).

Some water crossings are a mixture of bridges and tunnels, such as the Denmark to Sweden link and the Chesapeake Bay Bridge-Tunnel in Virginia.

There are particular hazards with tunnels, especially from vehicle fires when combustion gases can asphyxiate users, as happened at the Gotthard Road Tunnel in Switzerland in 2001. One of the worst railway disasters ever, the Balvano train disaster, was caused by a train stalling in the Armi tunnel in Italy in 1944, killing 426 passengers. Designers try to reduce these risks by installing emergency ventilation systems or isolated emergency escape tunnels parallel to the main passage.

Project planning and cost estimates

Government funds are often required for the creation of tunnels.[6] When a tunnel is being planned or constructed, economics and politics play a large factor in the decision making process. Civil engineers usually use project management techniques for developing a major structure. Understanding the amount of time the project requires, and the amount of labor and materials needed is a crucial part of project planning. The project duration must be identified using a work breakdown structure (WBS) and critical path method (CPM). Also, the land needed for excavation and construction staging, and the proper machinery must be selected. Large infrastructure projects require millions or even billions of dollars, involving long-term financing, usually through issuance of bonds.

The costs and benefits for an infrastructure such as a tunnel must be identified. Political disputes can occur, as in 2005 when the US House of Representatives approved a $100 million federal grant to build a tunnel under New York Harbor. However, the Port Authority of New York and New Jersey was not aware of this bill and had not asked for a grant for such a project.[7] Increased taxes to finance a large project may cause opposition.[8]


Tunnels are dug in types of materials varying from soft clay to hard rock. The method of tunnel construction depends on such factors as the ground conditions, the ground water conditions, the length and diameter of the tunnel drive, the depth of the tunnel, the logistics of supporting the tunnel excavation, the final use and shape of the tunnel and appropriate risk management.

There are three basic types of tunnel construction in common use:


Cut-and-cover construction of the Paris Métro in France

Cut-and-cover is a simple method of construction for shallow tunnels where a trench is excavated and roofed over with an overhead support system strong enough to carry the load of what is to be built above the tunnel. Two basic forms of cut-and-cover tunnelling are available:

Shallow tunnels are often of the cut-and-cover type (if under water, of the immersed-tube type), while deep tunnels are excavated, often using a tunnelling shield. For intermediate levels, both methods are possible.

Large cut-and-cover boxes are often used for underground metro stations, such as Canary Wharf tube station in London. This construction form generally has two levels, which allows economical arrangements for ticket hall, station platforms, passenger access and emergency egress, ventilation and smoke control, staff rooms, and equipment rooms. The interior of Canary Wharf station has been likened to an underground cathedral, owing to the sheer size of the excavation. This contrasts with many traditional stations on London Underground, where bored tunnels were used for stations and passenger access. Nevertheless, the original parts of the London Underground network, the Metropolitan and District Railways, were constructed using cut-and-cover. These lines pre-dated electric traction and the proximity to the surface was useful to ventilate the inevitable smoke and steam.

A major disadvantage of cut-and-cover is the widespread disruption generated at the surface level during construction. This, and the availability of electric traction, brought about London Underground's switch to bored tunnels at a deeper level towards the end of the 19th century.

Boring machines

Main article: Tunnel boring machine
A workman is dwarfed by the tunnel boring machine used to excavate the Gotthard Base Tunnel (Switzerland), the world's longest.

Tunnel boring machines (TBMs) and associated back-up systems are used to highly automate the entire tunnelling process, reducing tunnelling costs. In certain predominantly urban applications, tunnel boring is viewed as quick and cost effective alternative to laying surface rails and roads. Expensive compulsory purchase of buildings and land, with potentially lengthy planning inquiries, is eliminated. Disadvantages of TBMs arise from their usually large size - the difficulty of transporting the large TBM to the site of tunnel construction, or (alternatively) the high cost of assembling the TBM on-site, often within the confines of the tunnel being constructed.

There are a variety of TBM designs that can operate in a variety of conditions, from hard rock to soft water-bearing ground. Some types of TBMs, the bentonite slurry and earth-pressure balance machines, have pressurised compartments at the front end, allowing them to be used in difficult conditions below the water table. This pressurizes the ground ahead of the TBM cutter head to balance the water pressure. The operators work in normal air pressure behind the pressurised compartment, but may occasionally have to enter that compartment to renew or repair the cutters. This requires special precautions, such as local ground treatment or halting the TBM at a position free from water. Despite these difficulties, TBMs are now preferred over the older method of tunnelling in compressed air, with an air lock/decompression chamber some way back from the TBM, which required operators to work in high pressure and go through decompression procedures at the end of their shifts, much like deep-sea divers.

In February 2010, Aker Wirth delivered a TBM to Switzerland, for the expansion of the Linth–Limmern Power Stations located south of Linthal in the canton of Glarus. The borehole has a diameter of 8.03 metres (26.3 ft).[9] The four TBMs used for excavating the 57-kilometre (35 mi) Gotthard Base Tunnel, in Switzerland, had a diameter of about 9 metres (30 ft). A larger TBM was built to bore the Green Heart Tunnel (Dutch: Tunnel Groene Hart) as part of the HSL-Zuid in the Netherlands, with a diameter of 14.87 metres (48.8 ft).[10] This in turn was superseded by the Madrid M30 ringroad, Spain, and the Chong Ming tunnels in Shanghai, China. All of these machines were built at least partly by Herrenknecht. As of August 2013, the world's largest TBM is "Big Bertha", a 57.5-foot (17.5 m) diameter machine built by Hitachi Zosen Corporation, which is digging the Alaskan Way Viaduct replacement tunnel in Seattle, Washington (US).[11]


Clay-kicking is a specialised method developed in the United Kingdom of digging tunnels in strong clay-based soil structures. Unlike previous manual methods of using mattocks which relied on the soil structure to be hard, clay-kicking was relatively silent and hence did not harm soft clay-based structures. The clay-kicker lies on a plank at a 45-degree angle away from the working face and inserts a tool with a cup-like rounded end with the feet. Turning the tool manually, the kicker extracts a section of soil, which is then placed on the waste extract.

Used in Victorian civil engineering, the method found favour in the renewal of Britain's ancient sewerage systems, by not having to remove all property or infrastructure to create a small tunnel system. During the First World War, the system was used by Royal Engineer tunnelling companies to put mines beneath the German Empire lines. The method was virtually silent and so not susceptible to listening methods of detection.[12]


1886 illustration showing the ventilation and drainage system of the Mersey railway tunnel

A temporary access shaft is sometimes necessary during the excavation of a tunnel. They are usually circular and go straight down until they reach the level at which the tunnel is going to be built. A shaft normally has concrete walls and is usually built to be permanent. Once the access shafts are complete, TBMs are lowered to the bottom and excavation can start. Shafts are the main entrance in and out of the tunnel until the project is completed. If a tunnel is going to be long, multiple shafts at various locations may be bored so that entrance to the tunnel is closer to the unexcavated area.[5]

Once construction is complete, construction access shafts are often used as ventilation shafts, and may also be used as emergency exits.

Sprayed concrete techniques

The New Austrian Tunneling Method (NATM) was developed in the 1960s and is the best known of a number of engineering practices that use calculated and empirical measurements to provide safe support to the tunnel lining. The main idea of this method is to use the geological stress of the surrounding rock mass to stabilize the tunnel, by allowing a measured relaxation and stress reassignment into the surrounding rock to prevent full loads becoming imposed on the supports. Based on geotechnical measurements, an optimal cross section is computed. The excavation is protected by a layer of sprayed concrete, commonly referred to as shotcrete. Other support measures can include steel arches, rockbolts and mesh. Technological developments in sprayed concrete technology have resulted in steel and polypropylene fibres being added to the concrete mix to improve lining strength. This creates a natural load-bearing ring, which minimizes the rock's deformation.

Illowra Battery utility tunnel, Port Kembla. One of many bunkers south of Sydney.

By special monitoring the NATM method is flexible, even at surprising changes of the geomechanical rock consistency during the tunneling work. The measured rock properties lead to appropriate tools for tunnel strengthening. In the last decades also soft ground excavations up to 10 kilometres (6.2 mi) became usual.

Pipe jacking

Main article: Pipe jacking

In pipe jacking, hydraulic jacks are used to push specially made pipes through the ground behind a TBM or shield. This method is commonly used to create tunnels under existing structures, such as roads or railways. Tunnels constructed by pipe jacking are normally small diameter bores with a maximum size of around 3.2 metres (10 ft).

Box jacking

Box jacking is similar to pipe jacking, but instead of jacking tubes, a box-shaped tunnel is used. Jacked boxes can be a much larger span than a pipe jack, with the span of some box jacks in excess of 20 metres (66 ft). A cutting head is normally used at the front of the box being jacked, and spoil removal is normally by excavator from within the box.

Underwater tunnels

Main article: Undersea tunnel

There are also several approaches to underwater tunnels, the two most common being bored tunnels or immersed tubes, examples are Bjørvika Tunnel and Marmaray. Submerged floating tunnels are a novel approach under consideration; however, no such tunnels have been constructed to date.

Temporary way

During construction of a tunnel it is often convenient to install a temporary railway, particularly to remove excavated spoil, often narrow gauge so that it can be double track to allow the operation of empty and loaded trains at the same time. The temporary way is replaced by the permanent way at completion, thus explaining the term "Perway".


A utility tunnel in Prague

The vehicles or traffic using a tunnel can outgrow it, requiring replacement or enlargement:

Open building pit

An open building pit consists of a horizontal and a vertical boundary that keeps groundwater and soil out of the pit. There are several potential alternatives and combinations for (horizontal and vertical) building pit boundaries. The most important difference with cut-and-cover is that the open building pit is muted after tunnel construction; no roof is placed.

Other construction methods

Variant tunnel types

Double-deck and multipurpose tunnels

The upper level traffic lanes through Yerba Buena Island, part of the San Francisco–Oakland Bay Bridge

Some tunnels are double-deck, for example the two major segments of the San Francisco–Oakland Bay Bridge (completed in 1936) are linked by a double-deck tunnel through Yerba Buena Island, the largest-diameter bored tunnel in the world.[16] At construction this was a combination bidirectional rail and truck pathway on the lower deck with automobiles above, now converted to one-way road vehicle traffic on each deck.

In the Netherlands, a two-stack road tunnel is being constructed in the city of Maastricht. The two lower tubes of the tunnel will carry the A2 motorway, which originates in Amsterdam, through the city, and the two upper tubes will take the N2 regional highway for local traffic.[17] In the UK, the 1934 Queensway Tunnel under the River Mersey between Liverpool and Birkenhead was originally to have road vehicles running on the upper deck and trams on the lower. During construction the tram usage was cancelled. The lower section is only used for cables, pipes and emergency accident refuge enclosures.

In Hong Kong, the Lion Rock Tunnel, built in the mid 1960s connecting New Kowloon and Sha Tin, carries a motorway and an aqueduct.

A recent double-deck tunnel with both decks for motor vehicles is the Fuxing Road Tunnel in Shanghai, China. Cars travel on the two-lane upper deck, and heavier vehicles on the single-lane lower level.

Multipurpose tunnels exist that have more than one purpose. The SMART Tunnel in Malaysia is the first multipurpose flood control tunnel in the world, used both to convey traffic and occasional flood waters in Kuala Lumpur.

Common utility ducts or utility tunnels are carry two or more utility lines. Through co-location of different utilities in one tunnel, organizations are able to reduce the costs of building and maintaining utilities.

Covered passageways

The 19th century Dark Gate in Esztergom, Hungary

Over-bridges can sometimes be built by covering a road or river or railway with brick or steel arches, and then leveling the surface with earth. In railway parlance, a surface-level track which has been built or covered over is normally called a "covered way".

Snow sheds are a kind of artificial tunnel built to protect a railway from avalanches of snow. Similarly the Stanwell Park, New South Wales "steel tunnel", on the South Coast Line, protects the line from rockfalls.

Safety and security

Owing to the enclosed space of a tunnel, fires can have very serious effects on users. The main dangers are gas and smoke production, with even low concentrations of carbon monoxide being highly toxic. Fires killed 11 people in the Gotthard tunnel fire of 2001 for example, all of the victims succumbing to smoke and gas inhalation. Over 400 passengers died in the Balvano train disaster in Italy in 1944, when the locomotive halted in a long tunnel. Carbon monoxide poisoning was the main cause of death. In the Caldecott Tunnel fire of 1982, the majority of fatalities were caused by toxic smoke, rather than by the initial crash.

Motor vehicle tunnels usually require ventilation shafts and powered fans to remove toxic exhaust gases during routine operation.[18]

Rail tunnels usually require fewer air changes per hour, but still may require forced-air ventilation. Both types of tunnels often have provisions to increase ventilation under emergency conditions, such as a fire. Although there is a risk of increasing the rate of combustion through increased airflow, the primary focus is on providing breathable air to persons trapped in the tunnel, as well as firefighters.

When there is a parallel, separate tunnel available, airtight but unlocked emergency doors are usually provided which allow trapped personnel to escape from a smoke-filled tunnel to the parallel tube.[19]

Larger, heavily used tunnels, such as the Big Dig tunnel in Boston, Massachusetts, may have a dedicated 24-hour manned operations center which monitors and reports on traffic conditions, and responds to emergencies.[20] Video surveillance equipment is often used, and real-time pictures of traffic conditions for some highways may be viewable by the general public via the Internet.

Examples of tunnels

In history

The three eastern portals of Liverpool Edge Hill tunnels, built into a hand dug deep cutting. The left tunnel with tracks is the short 1846 second Crown Street Tunnel, still used for shunting; next on the right partially hidden by undergrowth is the 2.03 km (1.26 mi) 1829 disused Wapping Tunnel, to the right again hidden by undergrowth, is the original short disused 1829 Crown Street Tunnel.
A short section remains of the 1832 Edge Hill to Lime Street tunnel in Liverpool. This and a short section of the original tunnel nearer to Lime Street, are the oldest rail tunnels in the world still in active use.
The 1,659-foot (506 m) Donner Pass Summit Tunnel (#6) was in service from 1868 to 1993.
Southern portal of the 1791 Dudley canal tunnel in England
Liverpool Lime Street Approach. The original two track tunnel was removed to create a deep cutting. Some of the road bridges seen across the cutting are solid rock and in effect are a series of short tunnels.
A late 19th-century pneumatic rock-drilling machine, invented by Germain Sommeiller and used to drill the first large tunnels through the Alps.
Small operational brick tunnel in France

The history of ancient tunnels and tunneling in the world is reviewed in various sources which include many examples of these structures that were built for different purposes.[21][22] Some well known ancient and modern tunnels are briefly introduced below:



The Big Dig road vehicle tunnel in Boston, USA
The Gerrards Cross tunnel in England, completed in 2010. View west towards the station in March 2005, showing the extent of construction three months before a small section collapsed
The eastern portal of the abandoned Sideling Hill Tunnel, Pennsylvania, USA in 2009


Main article: Mining
Tunnel formerly used for coal mining in New Taipei, Taiwan

The use of tunnels for mining is called drift mining.

Military use

See also: Sapper

Some tunnels are not for transport at all but rather, are fortifications, for example Mittelwerk and Cheyenne Mountain Complex. Excavation techniques, as well as the construction of underground bunkers and other habitable areas, are often associated with military use during armed conflict, or civilian responses to threat of attack. One of the strangest uses of a tunnel was for the storage of chemical weapons[45][46] .

Secret tunnels

Main articles: Secret passage and Smuggling tunnel
Door to a compartment where runaway slaves would sleep, on the Underground Railroad

Secret tunnels have given entrance to or escape from an area, such as the Cu Chi Tunnels or the smuggling tunnels in the Gaza Strip which connect it to Egypt. Although the Underground Railroad network used to transport escaped slaves was "underground" mostly in the sense of secrecy, hidden tunnels were occasionally used. Secret tunnels were also used during the Cold War, under the Berlin Wall and elsewhere, to smuggle refugees, and for espionage.

Smugglers use secret tunnels to transport or store contraband, such as illegal drugs and weapons. Elaborately engineered 1,000-foot (300 m) tunnels built to smuggle drugs across the Mexico-US border were estimated to require up to 9 months to complete, and an expenditure of up to $1 million.[47] Some of these tunnels were equipped with lighting, ventilation, telephones, drainage pumps, hydraulic elevators, and in at least one instance, an electrified rail transport system.[47] Secret tunnels have also been used by thieves to break into bank vaults and retail stores after hours.[48][49]

The actual usage of erdstall tunnels is unknown but theories connect it to a rebirth ritual.

Natural tunnels

View through a natural tunnel in South Korea

Major accidents

See also


  2. NFPA Standard for Safeguarding Construction, Alteration, and Demolition Operations. National Fire Protection Association.
  3. Bickel. (1995). Tunnel engineering handbook, 2nd edition. CBS Publishers.
  4. Powers, P.J. (2007). Construction de-watering and groundwater control. Hoboken, NJ: John Wiley & Sons Inc.
  5. 1 2 United States Army Corps of Engineers. (1978). Tunnels and shafts in rock. Washington, DC: Department of the Army.
  6. "Capital Projects Funds". Cord.edu. Archived from the original on December 17, 2011. Retrieved 2013-04-19.
  7. Chan, Sewell (2005-08-03). "$100 Million for a Tunnel. What Tunnel?". The New York Times.
  8. "Encouraging U.S. Infrastructure Investment - Council on Foreign Relations". Cfr.org. Retrieved 2013-04-19.
  9. "Tunnels & Tunnelling International". Tunnelsonline.info. Retrieved 2013-04-19.
  10. "The Groene Hart Tunnel". Hslzuid.nl. Archived from the original on September 25, 2009. Retrieved 2013-04-19.
  11. Johnson, Kirk (December 4, 2012). "Engineering Projects Will Transform Seattle, All Along the Waterfront". The New York Times.
  12. "Tunnelling". tunnellersmemorial.com. Archived from the original on August 23, 2010. Retrieved 2010-06-20.
  13. "Archived copy". Archived from the original on 2016-03-04. Retrieved 2009-04-02.
  14. "Archived copy". Archived from the original on 2016-03-04. Retrieved 2009-04-02.
  15. The Railway Magazine August 2015, p12.
  16. "San Francisco-Oakland Bay Bridge". Bay Area Toll Authority.
  17. Unique stacked tunnel under Maastricht (archived) - Imtech Traffic & Infra
  18. Mishra, V K; Aggarwal, M L; Berghmans, P; Frijns, E; Int Panis, L; Chacko, K M (2015). "Dynamics of ultrafine particles inside a roadway tunnel". ENVIRONMENTAL MONITORING AND ASSESSMENT. 187 (12): 756. doi:10.1007/s10661-015-4948-x.
  19. Fridolf, K.; Ronchi, E.; Nilsson, D.; Frantzich, H. (2013). "Movement speed and exit choice in smoke-filled rail tunnels". Fire Safety Journal. 59: 8–21. doi:10.1016/j.firesaf.2013.03.007.
  20. Johnson, Christine M.; Edward L. Thomas (October 1999). "A Case Study Boston Central Artery/Tunnel Integrated Project Control System, Responding to incidents Rapidly and Effectively" (PDF). Metropolitan Transportation Management Center: 12. Retrieved 4 April 2014.
  21. Klaus Grewe, 1998, Licht am Ende des Tunnels – Planung und Trassierung im antiken Tunnelbau, Verlag Philipp von Zabern, Mainz am Rhein.
  22. Siamak Hashemi, 2013, The Magnificence of Civilization in Depths of Ground (A Review of Underground Structures in Iran – Past to Present), Shadrang Printing and Publishing Co., Tehran.
  23. UNESCO World Heritage Centre – World Heritage List: Qanats of Gonabad, Date of Inscription 2007, Reference No. 5207, At: "Archived copy". Archived from the original on 2016-03-29. Retrieved 2013-12-14.
  24. Schmidt, E.F., 1953, Persepolis I – Structures, Reliefs, Inscriptions; The University of Chicago Oriental Institute Publications, Volume LXVIII, The University of Chicago Press.
  25. Blogcu "Archived copy". Archived from the original on 2016-03-27. Retrieved 2014-07-17.
  26. Map of Dudley Canals | Discover Black Country Canals Archived April 9, 2015, at the Wayback Machine.
  27. "Fritchley Tunnel, Butterley Gangroad". Historic England. Retrieved 19 March 2015.
  28. 1 2 "Archaeologists find 'world's oldest railway tunnel' in Derbyshire". BBC News. 1 May 2013.
  29. 1 2 James Drummond (1 May 2013). "World's oldest railway tunnel hidden by a rockery for 36 years is discovered 10ft underground in a back garden". Mail Online.
  30. Friends of the Cromford Canal - HOME Archived October 23, 2016, at the Wayback Machine.
  31. "Bourne's Tunnel at Sj5033491804 - Saint Helens - St Helens - England". British Listed Buildings. Retrieved 30 September 2014.
  32. "Liverpool's Historic Rail Tunnels". The Liverpool Wiki. 1999-02-22. Retrieved 2013-04-19.
  33. 1 2 "Subterranea Britannica: Sites:". Retrieved 30 September 2014.
  34. "Wapping Tunnel". Retrieved 30 September 2014.
  35. Maund, T.B. (2001). Merseyrail electrics: the inside story. Sheffield: NBC Books. OCLC 655126526.
  36. Liverpool Lime St Archived March 4, 2016, at the Wayback Machine.
  37. "Victoria Tunnel". Retrieved 30 September 2014.
  38. "Waterloo Tunnel". Retrieved 30 September 2014.
  39. "Mersey Railway Tunnel". Retrieved 30 September 2014.
  40. Engineering Timelines - Mersey Railway Archived March 22, 2012, at the Wayback Machine.
  41. 1 2 Robie S. Lange (February 1993). "National Register of Historic Places Inventory-Nomination: St. Clair River Tunnel / St. Clair Railroad Tunnel" (PDF). National Park Service.
  42. Archived March 17, 2012, at the Wayback Machine.
  43. "Costain finishes Gerrards Cross tunnel rebuild". Retrieved 30 September 2014.
  44. "City Water Tunnel No. 3". Web.archive.org. Archived from the original on 2007-06-21. Retrieved 2013-04-19.
  45. "Glenbrook Tunnel - Alcatraz Down Under - History Channel". Youtube.com. Retrieved 2013-04-19.
  46. Author lifts lid on chemical wartime history - Local News - News - General - Blue Mountains Gazette Archived January 9, 2009, at the Wayback Machine.
  47. 1 2 Audi, Tamara (Jan 31, 2013). "Drug Tunnels Have Feds Digging for Answers". Wall Street Journal. Retrieved 2014-10-04.
  48. Colchester, Max (March 31, 2010). "Thieves Drill Into Paris Bank Vault". Wall Street Journal. Retrieved 2014-10-04.
  49. Evans, Peter (Oct 3, 2014). "Where 'Criminal Underworld' Is More Than a Euphemism". Wall Street Journal. Retrieved 2014-10-04.
  50. Warholm, Harald (Nov 10, 2014). "The hobby photograph has waited three years for this rare shot of the Torghatten mount". nrk.no. Retrieved 2014-11-13.


External links

Wikisource has the text of the 1879 American Cyclopædia article Tunnel.
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