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Traffic drives construction underground

3 April 2025

 

On 14 February, Dubai construction was thrust again onto the global stage when Elon Musk, the world’s richest man, announced plans to explore the development of an underground Dubai Loop transportation system, along the lines of the Las Vegas Convention Centre Loop project in the US.

Dubai has typically made headlines globally by constructing the world’s tallest towers. As the city becomes increasingly congested on the surface, it is taking some of its largest construction projects underground.

With Musk’s backing, the Dubai Loop scheme is the most high-profile tunnelling project launched to date. It involves carving a futuristic transport system underneath Dubai. The initial phase of the project is currently being studied by Dubai’s Roads & Transport Authority (RTA) in partnership with The Boring Company, which is owned by Musk. It will cover 17 kilometres (km) and have 11 stations, with the capacity to transport over 20,000 passengers an hour.

The project highlights the importance of expanding underground infrastructure in the Middle East region. This is mostly necessitated by the pressure that rapidly growing cities have put on existing transport and utility networks, particularly in major urban centres such as Dubai, Riyadh and Doha.

Underground opportunities

Projects that involve tunnelling, such as metro rail systems, underground highways and pedestrian walkways, are deemed key enablers in reducing congestion and optimising land use.

The recently completed metro systems in Riyadh and Doha are examples of how underground rail networks can facilitate efficient urban mobility, and more such schemes are planned. 

Without these subterranean projects, cities risk being stuck in a permanent state of gridlock, with longer commute times and decreased productivity. At the same time, tunnelling allows urban planners to integrate sustainable transport solutions, as well as large-scale utilities networks, without disturbing existing cityscapes, thereby enhancing connectivity and economic growth.

These developments signal a major shift in engineering priorities, with regional governments investing in underground transport, sewerage and metro extensions to accommodate their growing populations and infrastructure needs.

While the tower crane-dotted skylines of urban centres in the GCC attract attention, delivering major projects underground is an equally impressive engineering feat. Tunnelling under busy cities requires advanced excavation techniques, careful planning and coordination to avoid disruptions.

More tunnelling work is expected as Dubai takes another significant step forward in tackling its ongoing traffic problems [with] a new metro link

UAE tunnelling projects

Tunnelling work forms a significant portion of the Dubai Metro Blue Line extension. Awarded in December for AED20.5bn ($5.5bn), the project includes 15.5km of underground track and five subterranean stations. When operational in 2029, the Blue Line will significantly expand Dubai’s metro capacity, linking major residential and commercial hubs.

More tunnelling work is expected as Dubai takes another significant step forward in tackling its ongoing traffic problems by starting the procurement process for its next metro link: the Gold Line.

Although the technical details of the project have yet to be revealed, it is expected that tunnels will form a major component of the scheme given that the new line will run through busy urban areas where there is little space to build overground. 

The Gold Line will start at Al-Ghubaiba in Bur Dubai. It will run parallel to – and alleviate pressure on – the existing Red Line, before heading inland to Business Bay, Meydan, Global Village and residential developments in Dubailand.

As a first step, the RTA has sent a request for proposals to companies for the lead consultancy role on the multibillion-dollar project.

The UAE’s Etihad Rail also began a study of the tunnels required for the high-speed railway line connecting Abu Dhabi and Dubai in January. The survey works are ongoing on the Jaddaf and Dusup tunnels that will serve the high-speed rail link. Initial plans for the project include tunnelling works totalling 31km.

Another major tunnelling project in the UAE is the $22bn Dubai Strategic Sewerage Tunnels scheme. The client, Dubai Municipality, is preparing to tender its first packages, which include deep tunnels that will stretch 42km in Jebel Ali and 16km in Warsan.

The project will be delivered under a public-private partnership model, with international consortiums competing for contracts. Once completed, these tunnels will replace the traditional wastewater network, reducing energy consumption and enhancing long-term sustainability.

Saudi schemes

In Saudi Arabia, Riyadh is preparing to expand its metro network with the addition of a Line 7 and an extension to the existing Line 2.

The total length of Line 7 will be about 65km, of which 47km will be underground. The line will have 19 stations, 14 of which will be underground.

The project involves constructing a metro line linking the Qiddiya entertainment city development, King Abdullah International Gardens, King Salman Park, Misk City and Diriyah Gate. 

In March, the Royal Commission for Riyadh City (RCRC) gave consortiums until 15 June to submit their bids for a design-and-build contract for the construction of Line 7.

The planned Line 2 extension is 8.4km long, of which 7.1km is underground, and three out of its five stations will be built underground. The RCRC is expected to award the construction contract this year.

In January, the kingdom also completed the phased roll-out of the Riyadh Metro network. The current network comprises six lines spanning about 176km, of which 74km is constructed underground.

These numbers indicate that over 42% of the overall network is underground, highlighting the growing importance of tunnels in the kingdom’s plans to improve infrastructure in its most densely populated cities.

Tunnelling works are also a key component of the plans to improve the stormwater drainage system in Jeddah, where the municipality is preparing for the construction of the King Abdullah Road-Falasteen Road tunnel.

The three-year scheme involves constructing 5.3km of tunnels with an internal diameter of 7.2 metres using tunnel boring machines (TBMs) and another 3.4km of tunnels with a diameter of 3.5 metres driven by pipe jacking or TBMs.

At the kingdom’s Neom gigaproject, city planners are looking to find solutions to many of the problems faced in existing cities and, as a result, tunnels and large-scale underground utilities corridors are being built at the beginning of the project. For example, the development’s Delta Junction tunnels will serve as a railway junction connecting the Spine infrastructure corridor with the Neom Connector rail link to the Oxagon industrial zone. 

The project involves 26.5km of tunnelling work that will be split into a north and a south lot. The construction works are expected to begin this year as the client is evaluating the revised proposals submitted by firms in November last year.

Kuwait Metro will feature extensive tunnelling … ensuring minimal disruption to existing roads while integrating with future transport networks

Further tunnel projects

Beyond the Gulf, Egypt has a long history of tunnelling projects, as it has had to deal with crippling congestion and urban overcrowding for decades. In the 1980s, work was completed on two major projects that involved tunnelling: the first phase of the Cairo Metro system and the Greater Cairo wastewater project, which involved the construction of sewage tunnels on the east and west banks of the Nile. 

Today, Cairo’s tunnelling projects include the Cairo Metro Line 4 project. Spanning 42km with 39 stations, it involves over 20km of tunnels.

Meanwhile, in Morocco, national railway operator L’Office National des Chemins de Fer (ONCF) is constructing a tunnel project in Rabat.

In February, ONCF announced a 3.3km tunnel to be constructed under the Bou Regreg river at an estimated cost of MD1.4bn ($140m). The tunnel will connect the Sale and Agdal stations in an effort to alleviate traffic.

Similarly, the long-awaited Kuwait Metro will feature extensive tunnelling to navigate the dense urban fabric of Kuwait City, ensuring minimal disruption to existing roads while integrating with future transport networks. 

Qatar’s expansion of Doha Metro, meanwhile, requires additional underground infrastructure to connect developing areas and support the country’s vision for a comprehensive public transport system. 

Mecca Metro, already serving millions of pilgrims, is also set for further expansion, likely involving significant tunnelling to facilitate smoother access to holy sites while overcoming geographic constraints. 

In Oman, the Muscat Metro project is likewise expected to link key districts while preserving the city’s landscape and avoiding disruptions to arterial roads by introducing underground sections. 

All of these projects show that tunnels will play an important role in the region’s future as it strives to create cities with more efficient and environmentally sustainable transit and utilities systems. 

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Yasir Iqbal

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    When Dean McGrail describes the performance of the region’s construction market, he keeps returning to a single word: “stable”.

    After initial concerns that the market would experience a sharp downturn and project cancellations following the onset of conflict in the region, regional president McGrail says WSP has yet to see a single major contract cancelled across its regional portfolio.

    “We have seen some projects re-evaluated – questions around whether the mix between residential and commercial is right, and whether it should be luxury residential,” he says. “But as of today, we have not seen any projects cancelled, which is a real sign of resilience in the market.”

    Under the surface

    That resilience does not mean nothing has changed. McGrail is careful to separate re-evaluation from cancellation. Projects already on site and selling into the market are pressing ahead. It is schemes that have not yet been released for off-plan sales that are being paused and reconsidered.

    “None of the projects we are currently involved in have been put on hold or suspended,” he says. “It is more re-evaluation. Some of that is investor sentiment, but some of it is materials and logistics as well, which people do not necessarily consider.”

    Logistics, in particular, is a pressure that rarely makes the headlines. According to McGrail, shipping disruption has complicated the delivery of heavy equipment on certain schemes. “If we have big pieces of kit coming in – chillers or turbines for a power station – that becomes challenging,” he says.

    The bigger question is viability. And while rising material costs, set against softening sales prices, are forcing developers to reappraise the numbers, for now the balance sits firmly on the side of continuity. McGrail estimates that revalidation and feasibility work accounts for less than 3% of the firm’s current order book, with the remainder progressing as normal.

    “Requests for proposals have not slowed down across any of our disciplines or business units,” he says. “We are definitely seeing an uptick in infrastructure.”

    Infrastructure pivot

    That focus points to where McGrail expects the next few years of growth to come from. Rail sits at the centre of the UAE story, alongside road upgrades and other major developments in Abu Dhabi. In Dubai, the clearest signal of intent is the expansion of Al-Maktoum International airport.

    “Al-Maktoum is a really good indicator of the future direction of travel,” he says. “That is not a project that is slowing down. There has been a commitment to Emirates that it will move there, and it is still progressing.”

    The scale of the airport – and the challenge of relocating an airline the size of Emirates in one move – raises the question of how it will be funded. Here, McGrail returns to the theme of stability and to the mechanism that underpins it.

    “One of the beauties of this region is the ability of government to step in,” he says. “They can fund it. If the private sector does start to suffer, that is the backstop. They push money into infrastructure – roads, rail, airports – which keeps our industry moving.”

    Saudi reset

    In Saudi Arabia, the recalibration story predates the conflict, and McGrail says the change should be read as a strength rather than a retreat.

    “I am positive,” he says. “When the reprioritisation started at the beginning of 2025, having lived through the global financial crisis here, I saw the decision to stop, re-evaluate and reprioritise expenditure as a positive. When Vision 2030 was set, Saudi Arabia had not won Expo or the World Cup, so the reprioritisation was the right thing to do. Saudi Arabia will come out of it stronger. Short-term pain, long-term gain.”

    The nature of the work is shifting with the budget. McGrail sees the kingdom moving towards a model long familiar in the UAE, in which core infrastructure and a handful of landmark buildings are delivered first, before surrounding plots are carved up and sold on.

    “You establish a few key iconic buildings, then the plots on the outside are carved up and they look for external investment to come in and develop them,” he says. “It is no different from Downtown Dubai, where Emaar built the Burj Khalifa and a few buildings, then started selling plots.”

    That approach is increasingly tied to public-private partnerships (PPPs), although McGrail is measured on how far the model will stretch.

    “PPP is definitely becoming more prevalent on some of the larger infrastructure projects, though still not as significant as it was made out to be when they first started talking about it,” he says. He sees industrials, mining, healthcare and schools as a natural fit, rather than PPP becoming a blanket procurement route.

    Aviation is another priority. WSP was recently appointed to the rehabilitation of the existing terminal at Jeddah’s King Abdulaziz International airport, alongside a new terminal. It also recently secured a role on the expansion and upgrade of King Fahd International airport in Dammam.

    “Aviation is definitely a key area of focus for us as we head into the next 12, 24, 36 months,” McGrail says.

    Beyond the two dominant markets, McGrail sees pockets of activity but no challenge to the balance of the portfolio. In Qatar, he points to a recovery taking shape towards the end of last year, with WSP active on the Qatar Children’s Museum and continuing its long-running work with the Public Works Authority (Ashghal). Oman is generating masterplanning work, including reviving the Blue City scheme.

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  • Gas-fired projects drive resilience in UAE power sector

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    The $3bn Taweelah C combined-cycle gas turbine (CCGT) project has been the UAE power sector’s standout contract award this year, accounting for the majority of the $4.17bn in awards as of early September.

    The total is well below the record $12.02bn awarded in 2025, when Abu Dhabi’s $6bn round-the-clock solar photovoltaic (PV) and battery energy storage system (bess) project lifted the market to record levels. However, 2026 remains broadly consistent with recent years, compared with $5.93bn in 2024 and $3.05bn in 2023.

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    Gas-fired focus

    Emirates Water & Electricity Company (Ewec) signed the power-purchase agreement (PPA) for Taweelah C in June with a consortium comprising Abu Dhabi National Energy Company (Taqa), Saudi Arabia’s Al-Jomaih Energy & Water Company and Singapore’s Sembcorp Industries.

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    Abu Dhabi’s 3.3GW Al-Nouf IPP is another major gas-fired plant moving towards execution. Japan’s Sumitomo Corporation is expected to formally sign the PPA by the end of the year, while the joint venture of Spain’s Tecnicas Reunidas and Egypt’s Orascom Construction is also set to be confirmed as the engineering, procurement and construction (EPC) contractor.

    To put this into context, the deal would make 2026 the second most valuable year for power sector investment on record, eclipsing both 2017 and 2018, when contract awards in the UAE reached $7.39bn and $7.27bn, respectively.

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    The storage component will allow Dewa to use more solar power after sunset, reducing the gap between daytime generation and the evening demand peak.

    The 1,800MW sixth phase is also nearing completion, with Larsen & Toubro delivering the estimated $1.5bn project for Shuaa Energy 4, the project company formed by Dewa and Masdar.

    Dewa has increased the planned capacity of the solar park to 7,260MW by 2030, from its earlier target of 5,000MW.

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    In September, EtihadWE received bids for a contract to carry out a techno-economic feasibility study for a proposed 2GW subsea electricity interconnector with India.

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  • Riyadh awards $1.5bn metro rolling stock contracts

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    Saudi Arabia’s Royal Commission for Riyadh City (RCRC) has signed contracts worth about SR5.5bn ($1.5bn) to procure 94 additional trains for the Riyadh Metro network.

    Germany’s Siemens and France’s Alstom have been awarded the contracts. They cover rolling stock manufacture, onboard systems, equipment and related services.

    The procurement will increase the metro fleet from 183 to 277 trains. Deliveries are due to begin in phases in 2028, with the additional units subject to testing and operational trials before entering service.

    RCRC expects the programme to increase the network’s passenger capacity by 60%.

    The additional trains will be distributed across the six metro lines based on current demand and projected ridership.

    The Red Line will receive the largest capacity increase, at 142%, followed by the Yellow Line at 116% and the Blue Line at 60%. Capacity on the Orange and Purple lines will increase by 27% and 16%, respectively.

    Daily capacity on the Blue Line is set to increase from about 340,000 to 533,000 passengers. Capacity on the Red Line will rise from 154,000 to 370,000 passengers a day, while the Yellow Line will increase from 133,000 to more than 288,000.

    The expansion is intended to meet rising demand for public transport as Riyadh prepares to host Expo 2030 and the 2034 Fifa World Cup, alongside continued growth in residential, commercial and entertainment developments.

    Speaking at the 37th government press conference, RCRC chief executive Ibrahim Al-Sultan said the metro has carried more than 300 million passengers since it began operating.

    Average metro ridership rose by about 25% in the first nine months of 2026 compared with the same period in 2025, he added.

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    MEED’s October 2026 report on Saudi Arabia includes:

    > COMMENT: Saudi projects hold steady
    > GOVERNMENT: Riyadh looks to reset its regional defence outlook
    > ECONOMY: Conflict bolsters case for Saudi economic diversification
    > BANKING: Saudi lenders readjust to lower lending and deposit climate
    > UPSTREAM: Aramco upstream spending gathers pace
    > DOWNSTREAM: Sabic steps up Saudi petchems investment
    > POWER: Saudi Arabia’s power award activity slows
    > WATER: Saudi water sector hits sharp slowdown
    > CONSTRUCTION: Saudi construction defies the headwinds
    > TRANSPORT: Saudi infrastructure pushes forward amid conflict
    > DATABANK: Saudi data indicates project spending shift

    To see previous issues of MEED Business Review, please click here
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    Yasir Iqbal
  • Jeddah extends bid deadline for drainage scheme

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    The municipality is also advancing a second stormwater drainage project for the first package of Zone (BC), Old Zahraa, in Jeddah Governorate. The project is valued at about $30m.

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    MEED previously reported that Saudi contractor Thrustboring Construction Company had been selected for phases one and two of the project, each valued at about $175m, covering the construction of large-diameter stormwater drainage tunnels. As of August, an official agreement had yet to be signed.

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  • US initiates procurement for Expo 2030 Riyadh pavilion

    14 October 2026

     

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    The US Department of State has initiated market research to procure a design-and-build contract for the US Pavilion at Expo 2030 Riyadh.

    According to procurement documents released through the US federal contracting portal, the project covers the full design, construction, exhibition fit-out, maintenance, and eventual decommissioning and removal of the national pavilion.

    The total cost for the design, construction and decommissioning packages is estimated at $55m to $65m.

    The request for information notice was issued on 9 October.

    The pavilion will be developed on plot P5.N1.B03.01 within the Expo 2030 masterplan’s Technology district, fronting the Loop of Nations corridor.

    It spans 5,368 square metres (sq m), with a maximum permitted gross floor area (GFA) of 8,052 sq m and an overall building height limit of 20 metres.

    The planned temporary structure will rise approximately three storeys and house between 5,000 and 6,000 sq m of exhibition space. The brief requires the facility to accommodate at least 23,000 visitors a day over the event’s six-month duration.

    Additional programme elements include:

    • A rooftop garden and restaurant
    • Two commercial kitchens
    • A VIP reception suite
    • Dedicated retail and administrative office space
    • Back-of-house operational areas and exterior shaded public landscaping

    Interested contractors and joint ventures have been invited to submit capability statements by 11 November. Bidders must demonstrate prior experience delivering major pavilions or large-scale immersive exhibition spaces completed within the past 15 years, alongside international logistics and regional project delivery capabilities.

    UK-based engineering consultancy Buro Happold prepared the plot masterplanning and development guidelines for the zone.

    Another UK-headquartered firm, Trivandi, was selected in April as the operations partner for the US Pavilion at Riyadh Expo.

    Expo 2030 Riyadh will run from October 2030 to March 2031 under the theme Foresight for Tomorrow, with host authorities projecting roughly 42 million visits.

    The masterplan covers 6 square kilometres, making it one of the largest sites ever designated for a World Expo event.

    Situated north of the Saudi capital, the site will be near the future King Salman International airport and will provide direct access to Riyadh landmarks.

    The Public Investment Fund, Saudi Arabia’s sovereign wealth vehicle, launched Expo 2030 Riyadh Company – a wholly owned subsidiary – in June 2025 to build and operate facilities for Expo 2030.

    MEED’s October 2026 report on Saudi Arabia includes:

    > COMMENT: Saudi projects hold steady
    > GOVERNMENT: Riyadh looks to reset its regional defence outlook
    > ECONOMY: Conflict bolsters case for Saudi economic diversification
    > BANKING: Saudi lenders readjust to lower lending and deposit climate
    > UPSTREAM: Aramco upstream spending gathers pace
    > DOWNSTREAM: Sabic steps up Saudi petchems investment
    > POWER: Saudi Arabia’s power award activity slows
    > WATER: Saudi water sector hits sharp slowdown
    > CONSTRUCTION: Saudi construction defies the headwinds
    > TRANSPORT: Saudi infrastructure pushes forward amid conflict
    > DATABANK: Saudi data indicates project spending shift

    To see previous issues of MEED Business Review, please click here
    https://image.digitalinsightresearch.in/uploads/NewsArticle/20580855/main.jpeg
    Yasir Iqbal