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The Gulf’s next construction boom is happening underground

31 July 2026

 

Throughout the Gulf, some of the largest infrastructure contracts now being procured are for work that will never be seen from street level.

In the UAE, Saudi Arabia and Qatar, metro lines, sewer networks and highway links are increasingly being built underground, making tunnelling the default approach to urban expansion rather than an occasional engineering solution.

For two decades, the story of Gulf construction was told upwards, through record-breaking towers and ambitious skylines. Increasingly, it is now being told underground.

Three things are happening at once. Cities across the region have run out of spare surface land on which to build new roads and rail lines. National transport plans require capacity that surface routes cannot provide without demolishing what has already been built. And governments have recognised that land no longer needed for transport infrastructure is far more valuable when used for development or public space.

Dubai’s AED34bn ($9.2bn) Gold Line, its AED80bn ($22bn) Strategic Sewerage Tunnels project and Riyadh’s Metro Line 7 demonstrate that this calculation is now driving how the region’s biggest projects are delivered.

Metro and rail tunnels

The Gold Line illustrates this point clearly. Rather than extend the metro on elevated viaducts, as the original Red and Green lines did, Dubai’s Roads & Transport Authority (RTA) is building the new line entirely underground.

When completed in September 2032, the line will add 35% to the length of the Dubai Metro network, extending it by more than 42 kilometres through 18 stations. It will connect more than 55 real estate projects that are still under construction and serve about 1.5 million residents. Surface land along the route was judged too valuable to sacrifice for a viaduct.

Riyadh is following a similar path. Metro Line 7 will run 65km between Qiddiya Entertainment City, King Abdullah International Gardens, King Salman Park, Misk City and Diriyah Gate, with 47km of the route underground. Fourteen of its 19 stations will also be below ground, preserving valuable surface corridors that connect some of the kingdom’s most valuable gigaproject developments.

Dubai Metro’s Blue Line extension is already demonstrating the scale of the engineering involved. Its tunnel boring machine (TBM), named Al-Wugeisha by the RTA, began operating in May. The machine is 163 metres long, weighs more than 2,000 tonnes and advances at around 13 to 17 metres a day along 15.5km of the line’s 30km route.

The same constraints are shaping Etihad Rail’s planned high-speed line between Abu Dhabi and Dubai. Designed for trains travelling at up to 350km an hour, the railway will require underground sections through its urban core. The line’s stations at Al-Zahiyah and Abu Dhabi International airport, together with its Dubai station at Al-Jaddaf, will all be built below ground, as there is no practical way to route a high-speed railway through built-up city centres without demolishing existing development.

Dubai’s experiment with The Boring Company’s Loop system reflects the same shift towards underground infrastructure. The 6.4km first phase, valued at AED565m ($154m) and linking Dubai International Financial Centre to Dubai Mall, allows the emirate to test a lower-cost tunnelling model in a market still dominated by heavy civil engineering contractors. A second phase is already planned to extend the network to 22km and 19 stations within three years.

Rather than extend the metro on elevated viaducts, as the original Red and Green lines did, Dubai’s RTA is building the Gold Line entirely underground

Sewerage and stormwater tunnels

A second, less visible tunnelling boom is under way beneath the region’s streets in stormwater and sewerage infrastructure. Dubai Municipality is finalising the first packages of the Strategic Sewerage Tunnels project, an AED80bn public-private partnership divided into three packages terminating at pump stations in Warsan and Jebel Ali.

The scheme will convert Dubai’s sewerage system from a pumped network into a gravity-based one using deep tunnels and more than 200km of sewer links.

Qatar is implementing a smaller version of the same concept. Ashghal has recently awarded a $104m contract for a trunk sewer running from Sheehaniya to the Doha North sewage treatment works. The tunnel will extend for about 39km, with diameters ranging from 600mm to 1,800mm, serving a catchment area covering 27,320 hectares of villages, farms, military facilities and a new residential development.

These projects may lack the glamour of a metro line, but they demonstrate the same underlying principle. Once a city reaches a certain level of density, even routine utility infrastructure defaults to tunnelling rather than trenching.

Roads and enabling works

The third strand of the tunnelling boom covers the roads and enabling works that gigaprojects and dense cities increasingly require. Abu Dhabi’s Mid Island Parkway project combines bridges, a causeway and tunnels, including a cut-and-cover section on Bilrimaid Island, linking the emirate’s eastern islands.

Another scheme currently under tender will connect Hudayriat Island to the mainland through two underwater tunnels feeding a 4.8km highway.

In Al-Ain, Al-Fahjan Construction is boring a 120-metre tunnel through the Naqfa Mountains as part of a AED291m ($80m) dual carriageway, demonstrating that tunnelling is becoming viable outside the three largest urban centres wherever terrain, rather than density, presents the principal obstacle.

Sharjah and Riyadh illustrate how the same approach is being adopted across different scales of urban development. Sharjah’s Al-Taawun Tunnel, the centrepiece of a AED750m ($204m) road programme linking Al-Nahda Bridge towards Dubai, and Riyadh’s Thumamah Road package, where Turkish contractor Yuksel Holding’s local subsidiary is constructing three tunnels and three bridges designed to carry 200,000 vehicles a day by 2028, reflect the same need to maximise surface capacity while avoiding disruption above ground.

Dubai continues applying the same solution to smaller transport bottlenecks. The RTA’s contract to upgrade Umm Suqeim Street, Al-Wasl Road and Al-Safa Street includes bridges and tunnels totalling about 11km in what would once have been a straightforward at-grade junction improvement. The twin tunnels due to open on the Sheikh Rashid Corridor this August serve the same purpose: maintaining traffic flow between Oud Metha and Al-Wasl Club Street without adding a single lane of surface road.

The contractors that have absorbed the lessons from Riyadh Metro’s earlier phases and Dubai’s Blue Line, rather than simply bidding aggressively to secure a share of a buoyant market, are likely to emerge strongest

Contractors and technology

The contractors delivering these projects increasingly move between them. The same firms bid for metro tunnels, sewerage tunnels and road tunnels, while the TBM fleets, grouting crews and tunnelling expertise developed on one project are redeployed on the next, sometimes in a different country.

Turkish, Chinese, Korean and European civil engineering contractors that built Riyadh Metro’s earlier lines are now bidding for Metro Line 7 and for packages on Dubai’s Strategic Sewerage Tunnels project. Local firms such as Al-Marwan Contracting in Sharjah and Al-Fahjan Construction in Al-Ain also demonstrate that tunnelling is no longer the preserve of a handful of European and Japanese specialists, but a capability that regional contractors can increasingly offer.

Clients have noticed. Procurement is likely to favour contractors and joint ventures that can demonstrate tunnelling experience across multiple countries, because ground conditions, TBM logistics and underground station construction involve too much risk to entrust to first-time operators.

What happens next

The main constraint on the region’s tunnelling boom is unlikely to be client appetite or financing. Instead, it will be the availability of TBMs and specialist subcontractors. Herrenknecht and its competitors cannot manufacture bespoke machines overnight, and every metro, sewerage and highway tunnel competing for the same large-diameter TBMs will continue to push lead times and day rates higher throughout the remainder of the decade.

The pressure extends well beyond the machines themselves. Waterproofing, grouting, segment casting and ground-freezing specialists remain a relatively small global pool, and a region delivering metro, sewerage and highway tunnels simultaneously across three countries will inevitably compete for the same expertise.

Day rates for tunnelling specialists are therefore likely to strengthen before this cycle reaches its peak. Clients are also expected to secure framework agreements with preferred contractors rather than repeatedly tendering individual projects, simply to secure access to equipment and specialist crews.

Ground conditions remain the other major risk. The UAE’s gypsum-bearing and karstic geology, Riyadh’s mixed rock formations and Qatar’s high water table have already generated cost and programme surprises on previous tunnelling contracts. Delivering this volume of work within overlapping construction schedules makes it likely that some projects will experience delays or cost overruns.

The contractors that have absorbed the lessons from Riyadh Metro’s earlier phases and Dubai’s Blue Line, rather than simply bidding aggressively to secure a share of a buoyant market, are likely to emerge strongest.

The GCC’s tunnel boom is not a passing trend. The real question over the next decade is not whether governments will continue commissioning underground infrastructure, but which contractors have built the capability to deliver it without the delays and cost overruns that have affected comparable tunnelling booms elsewhere.

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Yasir Iqbal

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