105-446: A tunnel is an underground passage such as: Tunnel or Tunnels may also refer to: Tunnel A tunnel is an underground or undersea passageway. It is dug through surrounding soil, earth or rock, or laid under water, and is usually completely enclosed except for the two portals common at each end, though there may be access and ventilation openings at various points along the length. A pipeline differs significantly from
210-539: A few days, new fighting broke out. On 1 February, Hamas killed 6 people in an ambush on a Gaza convoy which delivered equipment for Abbas' Palestinian Presidential Guard . Fatah fighters stormed a Hamas-affiliated university in the Gaza Strip. Officers from Abbas' presidential guard battled Hamas gunmen guarding the Hamas-led Interior Ministry. In May 2007, new fighting broke out between
315-449: 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 and critical path method . Also, the land needed for excavation and construction staging, and
420-621: A major utility for the latter by supplying the country with a large unskilled and semi-skilled workforce. Gaza's agricultural sector was adversely affected as one-third of the Strip was appropriated by Israel, competition for scarce water resources stiffened, and the lucrative cultivation of citrus declined with the advent of Israeli policies, such as prohibitions on planting new trees and taxation that gave breaks to Israeli producers, factors which militated against growth. Gaza's direct exports of these products to Western markets, as opposed to Arab markets,
525-587: A massacre were reported to the United Nations General Assembly on 15 December 1956 by UNRWA director Henry Labouisse , who reported from "trustworthy sources" that 275 people were killed in the massacre, of which 140 were refugees and 135 local residents. On 12 November, days after the hostilities had ended, Israel killed 111 people in the Rafah refugee camp during Israeli operations, provoking international criticism. Israel ended
630-603: A military escalation in Gaza partially to prevent exacerbating the humanitarian crisis after the 2021 conflict. A tightened blockade since the start of the Israel–Hamas war has contributed to an ongoing famine . The Gaza Strip is 41 kilometres (25 miles) long, from 6 to 12 km (3.7 to 7.5 mi) wide, and has a total area of 365 km (141 sq mi). With around 2 million Palestinians on approximately 365 km (141 sq mi) of land, Gaza has one of
735-467: 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. Recent developments of the Jacked Arch and Jacked deck have enabled longer and larger structures to be installed to close accuracy. There are also several approaches to underwater tunnels,
840-493: A prominent feature of the fighting and mainly targeted Israeli civilians, contrasting with the relatively less violent nature of the First Intifada . With a combined casualty figure for combatants and civilians, the violence is estimated to have resulted in the deaths of approximately 3,000 Palestinians and 1,000 Israelis, as well as 64 foreigners. Between December 2000 and June 2001, the barrier between Gaza and Israel
945-425: A series of air strikes against targets in Gaza following the breakdown of a temporary truce between Israel and Hamas. Israel began a ground invasion of the Gaza Strip on 3 January 2009. Various sites that Israel claimed were being used as weapons depots were struck from the air : police stations, schools, hospitals, UN warehouses, mosques, various Hamas government buildings and other buildings. Israel said that
1050-426: A shift away from violence towards non-violent forms of protest. Some demonstrators were setting tires on fire and launching Molotov cocktails and rocks toward the troops on the opposite side of the border. Israeli officials said the demonstrations were used by Hamas as cover for launching attacks against Israel. In late February 2019, a United Nations Human Rights Council 's independent commission found that of
1155-421: A specialized method called clay-kicking for digging tunnels in clay-based soils. The clay-kicker lies on a plank at a 45-degree angle away from the working face and rather than a mattock with his hands, inserts with his feet a tool with a cup-like rounded end, then turns the tool with his hands to extract a section of soil, which is then placed on the waste extract. Clay-kicking is a specialized method developed in
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#17327865979541260-666: A strict blockade on Gaza in order to isolate Hamas from Islamist insurgents in the Sinai." In 2005, Israel withdrew from the Gaza Strip and dismantled its settlements. Israel also withdrew from the Philadelphi Route , a narrow strip of land adjacent to the border with Egypt, after Egypt agreed to secure its side of the border after the Agreement on Movement and Access , known as the Rafah Agreement . The Gaza Strip
1365-434: A tube can be sunk into a body of water, which is called an immersed tunnel. 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. There are two basic forms of cut-and-cover tunnelling: Shallow tunnels are often of the cut-and-cover type (if under water, of
1470-747: 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,
1575-917: 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 the tunnel. Some tunnels are used as sewers or aqueducts to supply water for consumption or for hydroelectric stations. 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. Tunnels can be connected together in tunnel networks . A tunnel
1680-432: 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
1785-657: A youth unemployment rate of 70%. Despite this, the area's 97% literacy rate is higher than that of nearby Egypt , while youth literacy is 88%. Gaza has throughout the years been seen as a source of Palestinian nationalism and resistance. Historically part of the Palestine region , the area was controlled since the 16th century by the Ottoman Empire ; in 1906, the Ottomans and the British Empire set
1890-543: Is 11 kilometres (7 miles) long. The First Intifada was a sustained series of protests and violent riots carried out by Palestinians in the Israeli-occupied Palestinian territories and Israel. It was motivated by collective Palestinian frustration over Israel's military occupation of the West Bank and the Gaza Strip, as it approached a twenty-year mark, having begun after Israel's victory in
1995-520: Is a small territory located on the eastern coast of the Mediterranean Sea ; it is the smaller of the two Palestinian territories , the other being the West Bank , that make up the State of Palestine . Inhabited by mostly Palestinian refugees and their descendants , Gaza is one of the most densely populated territories in the world . Gaza is bordered by Egypt on the southwest and Israel on
2100-469: Is allowed in this tunnel tube, and motorcyclists are directed to the other tube. Each level was built with a three-lane roadway, but only two lanes per level are used – the third serves as a hard shoulder within the tunnel. The A86 Duplex is Europe's longest double-deck tunnel. Gaza Strip The Gaza Strip ( / ˈ ɡ ɑː z ə / ; Arabic : قِطَاعُ غَزَّةَ Qiṭāʿ Ġazzah [qɪˈtˤɑːʕ ˈɣaz.za] ), also known simply as Gaza ,
2205-505: Is intended to carry both the Istanbul metro and a two-level highway, over a length of 6.5 km (4.0 miles). The French A86 Duplex Tunnel [ fr ] in west Paris consists of two bored tunnel tubes, the eastern one of which has two levels for light motorized vehicles, over a length of 10 km (6.2 miles). Although each level offers a physical height of 2.54 m (8.3 ft), only traffic up to 2 m (6.6 ft) tall
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#17327865979542310-698: Is now Israel. They protested against Israel's land, air and sea blockade of the Gaza Strip and the United States recognition of Jerusalem as capital of Israel . Most of the demonstrators demonstrated peacefully far from the border fence. Peter Cammack, a fellow with the Middle East Program at the Carnegie Endowment for International Peace , argued that the march indicated a new trend in Palestinian society and Hamas, with
2415-494: 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, in the United Kingdom, a road tunnel is defined as "a subsurface highway structure enclosed for a length of 150 metres (490 ft) or more." In
2520-401: 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
2625-515: Is that the open building pit is muted after tunnel construction; no roof is placed. 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 160-metre (540 ft) double-deck tunnel section through Yerba Buena Island , the largest-diameter bored tunnel in the world. At construction this was a combination bidirectional rail and truck pathway on
2730-698: Is the Siloam Tunnel , built in Jerusalem by the kings of Judah around the 8th century BC. Another tunnel excavated from both ends, maybe the second known, is the Tunnel of Eupalinos , which is a tunnel aqueduct 1,036 m (3,400 ft) long running through Mount Kastro in Samos , Greece. It was built in the 6th century BC to serve as an aqueduct . In Ethiopia , the Siqurto foot tunnel , hand-hewn in
2835-536: The 1948 Palestine war and more specifically the 1948 Arab–Israeli War , tens of thousands of Palestinian refugees fled or were expelled to the Gaza Strip. By the end of the war, 25% of Mandatory Palestine's Arab population was in Gaza, though the Strip constituted only 1% of the land. The same year, the United Nations Relief and Works Agency for Palestine Refugees in the Near East ( UNRWA )
2940-580: The 1967 Arab–Israeli War . The uprising lasted from December 1987 until the Madrid Conference of 1991 , though some date its conclusion to 1993, with the signing of the Oslo Accords . The intifada began on 9 December 1987, in the Jabalia refugee camp of the Gaza Strip after an Israeli army truck collided with a civilian car, killing four Palestinian workers. Palestinians charged that
3045-891: The Al-Aqsa compound on the Temple Mount in Jerusalem ; the visit itself was peaceful, but, as anticipated, sparked protests and riots that Israeli police put down with rubber bullets and tear gas. The Second Intifada also marked the beginning of rocket attacks and bombings of Israeli border localities by Palestinian guerrillas from the Gaza Strip, especially by the Hamas and Palestinian Islamic Jihad movements. High numbers of casualties were caused among civilians as well as combatants. Israeli forces engaged in gunfire, targeted killings , and tank and aerial attacks, while Palestinians engaged in suicide bombings , gunfire, stone-throwing , and rocket attacks . Palestinian suicide bombings were
3150-569: 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. Government funds are often required for the creation of tunnels. When a tunnel is being planned or constructed, economics and politics play
3255-639: The Egypt–Israel peace treaty . Among other things, the treaty provided for the withdrawal by Israel of its armed forces and civilians from the Sinai Peninsula, which Israel had captured during the Six-Day War. The Egyptians agreed to keep the Sinai Peninsula demilitarized. The final status of the Gaza Strip, and other relations between Israel and Palestinians, was not dealt with in the treaty. Egypt renounced all territorial claims to territory north of
Tunnel (disambiguation) - Misplaced Pages Continue
3360-642: The Israeli-occupied Palestinian territories and Israel. The general triggers for the unrest are speculated to have been centred on the failure of the 2000 Camp David Summit , which was expected to reach a final agreement on the Israeli–Palestinian peace process in July 2000. Outbreaks of violence began in September 2000, after Ariel Sharon , then the Israeli opposition leader , made a provocative visit to
3465-707: The Jewish Agency's " 11 points in the Negev " plan, in which 11 Jewish villages were built across the Negev in a single night as a response to the Morrison-Grady Plan , which threatened to exclude the Negev from a future Jewish State. In total, between 1967 and 2005, Israel established 21 settlements in Gaza, comprising 20% of the total territory. The economic growth rate from 1967 to 1982 averaged roughly 9.7 percent per annum, due in good part to expanded income from work opportunities inside Israel, which had
3570-733: The Palestine Liberation Organization (PLO) signed a second agreement , extending the Palestinian Authority to most West Bank towns. Between 1994 and 1996, Israel built the Gaza–Israel barrier to improve security in Israel. The barrier was largely torn down by Palestinians at the beginning of the Second Intifada in September 2000. The Second Intifada was a major Palestinian uprising in
3675-663: The Palestinian territories . The mid-1990s Oslo Accords established the Palestinian Authority (PA) as a limited governing authority, initially led by the secular party Fatah until that party's electoral defeat in 2006 to the Sunni Islamic Hamas . Hamas would then take over the governance of Gaza in a battle the next year, subsequently warring with Israel. The restrictions on movement and goods in Gaza imposed by Israel date back to
3780-471: 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. Increased taxes to finance a large project may cause opposition. 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 groundwater conditions, the length and diameter of
3885-848: 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 . The Sydney Harbour Tunnel
3990-472: The River Mersey at Liverpool was chosen over a massively high bridge partly for defense reasons; it was feared that aircraft could destroy a bridge in times of war, not merely impairing road traffic but blocking the river to navigation. 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
4095-679: The United Kingdom of digging tunnels in strong clay-based soil structures. This method of cut and cover construction required relatively little disturbance of property during the renewal of the United Kingdom's then ancient sewerage systems. It was also used during the First World War by Royal Engineer tunnelling companies placing mines beneath German lines, because it was almost silent and so not susceptible to listening methods of detection. Tunnel boring machines (TBMs) and associated back-up systems are used to highly automate
4200-610: The canton of Glarus . The borehole has a diameter of 8.03 metres (26.3 ft). 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). This in turn
4305-489: 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 pressurized 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
Tunnel (disambiguation) - Misplaced Pages Continue
4410-689: The 16th century as a metaphor for a narrow, confined space like the inside of a cask. Some of the earliest tunnels used by humans were paleoburrows excavated by prehistoric mammals. 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. Predecessors of modern tunnels were adits that transported water for irrigation , drinking, or sewerage . The first qanats are known from before 2000 BC. The earliest tunnel known to have been excavated from both ends
4515-628: The 1956 Suez Crisis (the Second Arab–Israeli war), Israel invaded Gaza and the Sinai Peninsula. On 3 November, the Israel Defense Forces (IDF) attacked Egyptian and Palestinian forces at Khan Yunis . The city of Khan Yunis resisted being captured, and Israel responded with a heavy bombing campaign that inflicted heavy civilian casualties. After a fierce battle, the Israeli 37th Armored Brigade's Sherman tanks broke through
4620-638: The 1960s. 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, rock bolts, and mesh. Technological developments in sprayed concrete technology have resulted in steel and polypropylene fibers being added to
4725-586: The 1967 Arab-Israeli War, "various international agencies struggled to respond" and American Near East Refugee Aid was founded to help victims of the conflict by providing immediate emergency relief. Subsequent to this military victory, Israel created the first Israeli settlement bloc in the Strip, Gush Katif , in the southwest corner near Rafah and the Egyptian border on a spot where a small kibbutz had previously existed for 18 months between 1946 and 1948. The kibbutz community had been established as part of
4830-454: The 1967 war. Ultimately, the Strip lost 25% (a conservative estimate) of its prewar population between 1967 and 1968. In 1970-1971 Ariel Sharon implemented what became known as a 'five finger' strategy, which consisted in creating military areas and settlements by breaking the Strip into five zones to better enable Israeli occupation, settlement and, by discontinuous fragmentation of the Palestinian zones created, allow an efficient management of
4935-716: 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 might prevent US Navy vessels from leaving Naval Station Norfolk . Water-crossing tunnels built instead of bridges include the Seikan Tunnel in Japan; the Holland Tunnel and Lincoln Tunnel between New Jersey and Manhattan in New York City ;
5040-415: The 22-day war. The conflict damaged or destroyed tens of thousands of homes, 15 of Gaza's 27 hospitals and 43 of its 110 primary health care facilities, 800 water wells, 186 greenhouses, and nearly all of its 10,000 family farms; leaving 50,000 homeless, 400,000–500,000 without running water, one million without electricity, and resulting in acute food shortages. The people of Gaza still suffer from
5145-402: The 489 cases of Palestinian deaths or injuries analyzed, only two were possibly justified as responses to danger by Israeli security forces. The commission deemed the rest of the cases illegal, and concluded with a recommendation calling on Israel to examine whether war crimes or crimes against humanity had been committed, and if so, to bring those responsible to trial. On 28 February 2019,
5250-492: The Commission said it had " 'reasonable grounds' to believe Israeli soldiers may have committed war crimes and shot at journalists, health workers and children during protests in Gaza in 2018." Israel refused to take part in the inquiry and rejected the report. Before the 2021 Israel–Palestine crisis , Gaza had 48% unemployment and half of the population lived in poverty. During the crisis, 66 children died (551 children in
5355-526: The Gaza Strip. Palestinian President Mahmoud Abbas responded by declaring a state of emergency , dissolving the unity government and forming a new government without Hamas participation. PNA security forces in the West Bank arrested a number of Hamas members. In late June 2008, Egypt, Saudi Arabia and Jordan declared the West Bank-based cabinet formed by Abbas as "the sole legitimate Palestinian government". Egypt moved its embassy from Gaza to
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#17327865979545460-504: The Gaza–Egypt border for fear of being kidnapped or harmed. Arab foreign ministers and Palestinian officials presented a united front against control of the border by Hamas. Meanwhile, Israeli and Egyptian security reports said that Hamas continued smuggling in large quantities of explosives and arms from Egypt through tunnels. Egyptian security forces uncovered 60 tunnels in 2007. On 23 January 2008, after months of preparation during which
5565-681: The IDF initiated Operation Brother's Keeper , in which some 350 Palestinians, including nearly all of the active Hamas militants in the West Bank, were arrested. Hamas subsequently fired a greater number of rockets into Israel from Gaza, triggering a seven-week-long conflict between the two sides. It was one of the deadliest outbreaks of open conflict between Israel and the Palestinians in decades. The combination of Palestinian rocket attacks and Israeli airstrikes resulted in thousands of deaths,
5670-709: The Middle Ages, crosses a mountain ridge. In the Gaza Strip , the network of tunnels was used by Jewish strategists as rock-cut shelters, in first links to Judean resistance against Roman rule in the Bar Kokhba revolt during the 2nd century AD. 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
5775-524: The Oslo Accords, a phased transfer of governmental authority to the Palestinians took place. Much of the Strip came under Palestinian control, except for the settlement blocs and military areas. The Israeli forces left Gaza City and other urban areas, leaving the new Palestinian Authority to administer and police those areas. The Palestinian Authority, led by Yasser Arafat , chose Gaza City as its first provincial headquarters. In September 1995, Israel and
5880-445: The Palestinian Authority , although some aid money was redirected to humanitarian organizations not affiliated with the government. The resulting political disorder and economic stagnation led to many Palestinians emigrating from the Gaza Strip. In January 2007, fighting erupted between Hamas and Fatah . The deadliest clashes occurred in the northern Gaza Strip. On 30 January 2007, a truce was negotiated between Fatah and Hamas. After
5985-416: The Six-Day War, IDF captured Gaza. Under the then head of Israel's Southern Command Ariel Sharon , dozens of Palestinians, suspected of being members of the resistance, were executed without trial. Between 1967 and 1968, Israel evicted approximately 75,000 residents of the Gaza Strip who Golda Meir described as a "fifth column". In addition, at least 25,000 Gazan residents were prevented from returning after
6090-538: The Strip, but instead treated it as a controlled territory and administered it through a military governor. The influx of over 200,000 refugees from former Mandatory Palestine, roughly a quarter of those who fled or were expelled from their homes during, and in the aftermath of, the 1948 Arab–Israeli War into Gaza resulted in a dramatic decrease in the standard of living. Because the Egyptian government restricted movement to and from Gaza, its inhabitants could not look elsewhere for gainful employment. In June 1967, during
6195-423: 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)." The word "tunnel" comes from the Middle English tonnelle , meaning "a net", derived from Old French tonnel , a diminutive of tonne ("cask"). The modern meaning, referring to an underground passageway, evolved in
6300-440: The West Bank and Gaza Strip. These contrasted with civil efforts including general strikes , boycotts of Israeli Civil Administration institutions in the Gaza Strip and the West Bank, an economic boycott consisting of refusal to work in Israeli settlements on Israeli products, refusal to pay taxes, and refusal to drive Palestinian cars with Israeli licenses. In May 1994, following the Palestinian-Israeli agreements known as
6405-421: The West Bank. Saudi Arabia and Egypt supported reconciliation and a new unity government and pressed Abbas to start talks with Hamas. Abbas had always conditioned this on Hamas returning control of the Gaza Strip to the Palestinian Authority. After the takeover, Israel and Egypt closed their border crossings with Gaza . Palestinian sources reported that European Union monitors fled the Rafah Border Crossing , on
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#17327865979546510-410: The area. Thousands of homes were bulldozed and large numbers of Bedouin families were exiled to the Sinai. Between 1973 (after the Yom Kippur War ) and 1987, official policy on economic development in the Gaza Strip remained the same as in 1969 with limited local investment and economic opportunity coming primarily from employment in Israel. According to Tom Segev , moving the Palestinians out of
6615-530: The attack was a response to Hamas rocket attacks on southern Israel, which totaled over 3,000 in 2008 , and which intensified during the few weeks preceding the operation. Israel advised people near military targets to leave before the attacks. Israeli defense sources said that Defense Minister Ehud Barak instructed the IDF to prepare for the operation six months before it began, using long-term planning and intelligence-gathering. A total of 1,100–1,400 Palestinians (295–926 civilians) and 13 Israelis were killed in
6720-400: 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
6825-754: The border. Egypt arrested and later released several armed Hamas militants in the Sinai who presumably wanted to infiltrate into Israel. At the same time, Israel increased its state of alert along the length of the Israel–Egypt Sinai border, and warned its citizens to leave Sinai "without delay." In February 2008, the Israel–Gaza conflict intensified, with rockets launched at Israeli cities. Aggression by Hamas led to Israeli military action on 1 March 2008, resulting in over 110 Palestinians being killed according to BBC News, as well as 2 Israeli soldiers. Israeli human rights group B'Tselem estimated that 45 of those killed were not involved in hostilities, and 15 were minors. On 27 December 2008, Israeli F-16 fighters launched
6930-449: The cessation of hostilities, the Israel–Egypt Armistice Agreement of 24 February 1949 established the line of separation between Egyptian and Israeli forces, as well as the modern boundary between Gaza and Israel, which both signatories declared not to be an international border. The southern border with Egypt was unchanged. Palestinians living in Gaza or Egypt were issued All-Palestine passports. Egypt did not offer them citizenship. From
7035-432: The collision was a deliberate response for the killing of an Israeli in Gaza days earlier. Israel denied that the crash, which came at time of heightened tensions, was intentional or coordinated. The Palestinian response was characterized by protests, civil disobedience , and violence. There was graffiti , barricading , and widespread throwing of stones and Molotov cocktails at the IDF and its infrastructure within
7140-451: The concrete mix to improve lining strength. This creates a natural load-bearing ring, which minimizes the rock's deformation . 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 pipe jacking , hydraulic jacks are used to push specially made pipes through
7245-550: The country had been a persistent element of Zionist thinking from early times. In December 1967, during a meeting at which the Security Cabinet brainstormed about what to do with the Arab population of the newly occupied territories, one of the suggestions Prime Minister Levi Eshkol proffered regarding Gaza was that the people might leave if Israel restricted their access to water supplies. A number of measures, including financial incentives, were taken shortly afterwards to begin to encourage Gazans to emigrate elsewhere. Following
7350-470: The early 1990s. In 2005, Israel unilaterally withdrew its military forces from Gaza, dismantled its settlements , and implemented a temporary blockade of Gaza . The blockade became indefinite after the 2007 Hamas takeover. Egypt also began its blockade of Gaza in 2007. Despite the Israeli disengagement, Gaza is still considered occupied by Israel under international law . The current blockade prevents people and goods from freely entering or leaving
7455-458: The east and north. The territory has been under Israeli occupation since 1967 . The territorial boundaries were established while Gaza was controlled by Egypt at the conclusion of the 1948 Arab–Israeli war , and it became a refuge for Palestinians who fled or were expelled during the 1948 Palestine war . Later, during the 1967 Six-Day War , Israel captured and occupied the Gaza Strip, initiating its decades-long military occupation of
7560-585: The end of 1949, they received aid directly from UNRWA. During the Suez Crisis (1956), Gaza and the Sinai Peninsula were occupied by Israeli troops, who withdrew under international pressure. The All-Palestine government was accused of being little more than a façade for Egyptian control, with negligible independent funding or influence. It subsequently moved to Cairo and dissolved in 1959 by decree of Egyptian President Gamal Abdul Nasser . During
7665-620: The end of the Fatah-Hamas coalition government , and possibly the end of the Palestinian authority. Hamas spokesman Mousa Abu Marzook blamed the conflict between Hamas and Fatah on Israel, stating that the constant pressure of economic sanctions resulted in the "real explosion." From 2006 to 2007 more than 600 Palestinians were killed in fighting between Hamas and Fatah. 349 Palestinians were killed in fighting between factions in 2007. 160 Palestinians killed each other in June alone. Following
7770-409: The entire tunnelling process, reducing tunnelling costs. In certain predominantly urban applications, tunnel boring is viewed as a 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
7875-475: The factions. Interior Minister Hani Qawasmi , who had been considered a moderate civil servant acceptable to both factions, resigned due to what he termed harmful behavior by both sides. Fighting spread in the Gaza Strip, with both factions attacking vehicles and facilities of the other side. Following a breakdown in an Egyptian-brokered truce, Israel launched an air strike which destroyed a building used by Hamas. Ongoing violence prompted fear that it could bring
7980-441: 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: For water crossings, a tunnel is generally more costly to construct than a bridge. However, both navigational and traffic considerations may limit the use of high bridges or drawbridges intersecting with shipping channels, necessitating
8085-405: 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 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
8190-515: The heavily fortified lines outside of Khan Yunis held by the 86th Palestinian Brigade. After some street-fighting with Egyptian soldiers and Palestinian fedayeen , Khan Yunis fell to the Israelis. Upon capturing Khan Yunis, the IDF committed an alleged massacre . Israeli troops started executing unarmed Palestinians, mostly civilians; in one instance men were lined up against walls in central square and executed with machine guns . The claims of
8295-640: 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
8400-435: 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. Prior to the replacement of manual excavation by the use of boring machines, Victorian tunnel excavators developed
8505-468: The international border. The Gaza Strip remained under Israeli military administration. The Israeli military became responsible for the maintenance of civil facilities and services. After the 1979 Egypt–Israel peace treaty, a 100-meter-wide buffer zone between Gaza and Egypt known as the Philadelphi Route was established. The international border along the Philadelphi corridor between Egypt and Gaza
8610-468: 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 TBMs, the bentonite slurry and earth-pressure balance types, have pressurized compartments at the front end, allowing them to be used in difficult conditions below
8715-505: The loss of these facilities and homes, especially since they have great challenges to rebuild them. On 5 June 2014, Fatah signed a unity agreement with the Hamas political party. The 2014 Gaza War , also known as Operation Protective Edge, was a military operation launched by Israel on 8 July 2014 in the Gaza Strip. Following the kidnapping and murder of three Israeli teenagers in the West Bank by Hamas-affiliated Palestinian militants,
8820-629: The lower deck with automobiles above, now converted to one-way road vehicle traffic on each deck. In Turkey, the Eurasia Tunnel under the Bosphorus , opened in 2016, has at its core a 5.4 km (3.4 miles) two-deck road tunnel with two lanes on each deck. Additionally, in 2015 the Turkish government announced that it will build three -level tunnel, also under the Bosporus. The tunnel
8925-569: The occupation in March 1957, amid international pressure. During the four-month Israeli occupation, 900–1,231 people were killed. According to French historian Jean-Pierre Filiu , 1% of the population of Gaza was killed, wounded, imprisoned or tortured during the occupation. After the dissolution of the All-Palestine Government in 1959, under the excuse of pan-Arabism, Egypt continued to occupy Gaza until 1967. Egypt never annexed
9030-483: The older method of tunnelling in compressed air, with an airlock/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
9135-540: 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 ". The vehicles or traffic using a tunnel can outgrow it, requiring replacement or enlargement: 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
9240-522: 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. Once construction is complete, construction access shafts are often used as ventilation shafts , and may also be used as emergency exits. The New Austrian Tunnelling method (NATM)—also referred to as the Sequential Excavation Method (SEM) —was developed in
9345-490: 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,
9450-675: The region's international border with Egypt . With the defeat of the Central Powers in World War I and the subsequent partition of the Ottoman Empire , the British deferred the governance of the Gaza Strip area to Egypt, which declined the responsibility. Britain itself kept and ruled the territory it occupied in 1917–18, from 1920 until 1948 under the internationally accepted frame of " Mandatory Palestine ". During
9555-482: 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
9660-542: 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
9765-401: The steel reinforcement of the border barrier was weakened, Hamas destroyed several parts of the wall dividing Gaza and Egypt in the town of Rafah . Hundreds of thousands of Gazans crossed the border into Egypt seeking food and supplies. Due to the crisis, Egyptian President Hosni Mubarak ordered his troops to allow the Palestinians in but to verify that they did not bring weapons back across
9870-441: The territory, leading to Gaza often being called an "open-air prison". The UN, as well as at least 19 human-rights organizations, have urged Israel to lift the blockade. Israel has justified its blockade on the strip with wanting to stop flow of arms, but Palestinians and rights groups say it amounts to collective punishment and exacerbates dire living conditions. Prior to the Israel–Hamas war , Hamas had said that it did not want
9975-400: The tunnel drive, the depth of the tunnel, the logistics of supporting the tunnel excavation, the final use and the shape of the tunnel and appropriate risk management. There are three basic types of tunnel construction in common use. Cut-and-cover tunnels are constructed in a shallow trench and then covered over. Bored tunnels are constructed in situ, without removing the ground above. Finally,
10080-428: 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. 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
10185-565: The vast majority of which were Gazan Palestinians. In 2018–2019, a series of protests , also known as the Great March of Return, were held each Friday in the Gaza Strip near the Israel–Gaza barrier from 30 March 2018 until 27 December 2019, during which a total of 223 Palestinians were killed by Israeli forces. The demonstrators demanded that the Palestinian refugees must be allowed to return to lands they were displaced from in what
10290-463: The victory of Hamas in the 2006 Palestinian legislative election , Hamas and Fatah formed the Palestinian authority national unity government headed by Ismail Haniyeh . Shortly after, Hamas took control of the Gaza Strip in the course of the Battle of Gaza (June 2007), seizing government institutions and replacing Fatah and other government officials with its own. By 14 June, Hamas fully controlled
10395-440: The world's highest population densities . More than 70% of Gaza's population are Palestinian refugees , half of whom are under the age of 18. Sunni Muslims make up most of Gaza's population, with a Palestinian Christian minority. Gaza has an annual population growth rate of 1.99% (2023 est.), the 39th-highest in the world. Gaza's unemployment rate is among the highest in the world, with an overall unemployment rate of 46% and
10500-575: Was constructed to provide a second harbour crossing and to alleviate traffic congestion on the Sydney Harbour Bridge , without spoiling the iconic view. 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
10605-813: Was established to administer various refugee programmes. On 22 September 1948 (near the end of the Arab–Israeli War), in the Egyptian-occupied Gaza City , the Arab League proclaimed the All-Palestine Government, partly to limit Transjordan 's influence over Palestine. The All-Palestine Protectorate was quickly recognized by six of the Arab League's then-seven members (excluding Transjordan): Egypt, Syria , Lebanon , Iraq , Saudi Arabia , and Yemen . After
10710-631: Was left under the control of the Palestinian Authority . In the Palestinian parliamentary elections held on 25 January 2006, Hamas won a plurality of 42.9% of the total vote and 74 out of 132 total seats (56%). When Hamas assumed power the next month, Israel, the United States, the EU, Russia and the UN demanded that Hamas accept all previous agreements, recognize Israel's right to exist, and renounce violence; when Hamas refused, they cut off direct aid to
10815-465: Was prohibited except through Israeli marketing vehicles, in order to assist Israeli citrus exports to the same markets. The overall result was that large numbers of farmers were forced out of the agricultural sector. Israel placed quotas on all goods exported from Gaza, while abolishing restrictions on the flow of Israeli goods into the Strip. Sara Roy characterised the pattern as one of structural de-development. On 26 March 1979, Israel and Egypt signed
10920-652: Was reconstructed. A barrier on the Gaza Strip-Egypt border was constructed starting in 2004. The main crossing points are the northern Erez Crossing into Israel and the southern Rafah Crossing into Egypt. The eastern Karni Crossing used for cargo, closed down in 2011. Israel controls the Gaza Strip's northern borders, as well as its territorial waters and airspace. Egypt controls Gaza Strip's southern border, under an agreement between it and Israel. Neither Israel or Egypt permits free travel from Gaza as both borders are heavily militarily fortified. "Egypt maintains
11025-732: 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 was " Big Bertha ", a 17.5-metre (57.5 ft) diameter machine built by Hitachi Zosen Corporation , which dug the Alaskan Way Viaduct replacement tunnel in Seattle, Washington (US). A temporary access shaft
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