The Line Reality: From 170km to 2.4km Phase 1, Cost Revisions, and Adjusted Population Targets

The Line was meant to be the most ambitious construction project in human history. A mirrored linear city stretching 170 kilometers across the deserts and mountains of northwestern Saudi Arabia, standing 500 meters tall and just 200 meters wide, The Line was designed to house nine million people in a structure visible from space. No cars, no streets, no carbon emissions—just a continuous architectural ribbon powered by renewable energy and connected by a high-speed transit system that could carry residents from one end to the other in twenty minutes. By early 2026, The Line has been reduced to a 2.4-kilometer Phase 1 section targeting an initial population of 200,000 to 300,000. This is the story of what happened between the dream and the diminished reality.

The Original Specification: Engineering at the Edge of Possibility

When The Line was formally unveiled in January 2021, the specifications read like science fiction rendered in engineering documents. The structure would stretch 170 kilometers from the coast of the Gulf of Aqaba inland through the Hejaz Mountains and into the desert. At 500 meters tall—roughly the height of One World Trade Center—and 200 meters wide, The Line would contain approximately 17 billion square feet of floor space, making it by far the largest structure ever built by several orders of magnitude.

The interior was designed as a series of interconnected communities, each functioning as a self-contained neighborhood with all essential services within a five-minute walk. Residents would never need to travel more than a few vertical or horizontal minutes to reach schools, healthcare, retail, parks, and workplaces. The structure would be skinned in mirrored glass, reflecting the desert landscape and creating an otherworldly visual effect. Inside, natural light would penetrate through gaps and openings in the structure, with artificial environments recreating parks, gardens, and even simulated weather.

Transportation was to be handled by a high-speed rail system running beneath the structure at speeds up to 512 kilometers per hour, enabling end-to-end transit in approximately twenty minutes. Vertical transportation—elevators, escalators, and potentially novel systems—would connect the various levels. Autonomous pods and moving walkways would handle medium-distance horizontal travel within communities.

The environmental systems were equally ambitious. The Line was to be powered entirely by renewable energy, primarily solar and wind, with massive battery storage systems. Water would come from desalination plants along the coast, with comprehensive recycling and gray water systems. Waste management would be fully automated, with pneumatic collection systems moving waste to processing facilities without the need for garbage trucks or collection crews.

The estimated cost for the full 170-kilometer structure was never officially disclosed but was widely reported to be between $200 billion and $500 billion depending on the specification level. Some independent estimates placed the true all-in cost—including supporting infrastructure, technology systems, and the economic ecosystem required to attract residents—at over $1 trillion.

Early Construction: The Scale of Ambition Made Physical

Construction on The Line began in earnest in 2022, and the scale of the initial earthworks was genuinely staggering. The excavation operation was described by project managers as the largest single earthmoving project in history, exceeding even the Panama Canal expansion and China’s Three Gorges Dam. Hundreds of excavators, dump trucks, and earthmoving machines operated around the clock in the desert heat, cutting through rock and sand to create the foundations for the linear structure.

The workforce grew rapidly, eventually exceeding 50,000 workers dedicated to The Line alone, with many more working on supporting infrastructure. Worker camps—essentially small cities in their own right—were constructed to house this massive labor force. The logistics chain to feed, supply, and support operations in this remote location was itself a major undertaking.

Early construction focused on creating the foundation trench along the full route. This involved not just excavation but significant rock blasting and stabilization work, particularly in the mountainous sections where the terrain was most challenging. The foundation design called for massive concrete and steel structures capable of supporting the 500-meter-tall building above, requiring geotechnical analysis and foundation engineering of unprecedented complexity.

Parallel to the earthworks, design development continued at a frenetic pace. NEOM maintained offices in Riyadh, London, New York, and several other global cities, with thousands of architects, engineers, and designers working on different aspects of the project. The design process was unusual in that construction was proceeding simultaneously with detailed design—a approach that would prove problematic as engineering realities emerged that conflicted with earlier assumptions.

The Engineering Challenges: Why Physics Intervened

Several fundamental engineering challenges emerged as detailed design and early construction progressed. These challenges, individually manageable in conventional construction, proved overwhelming in combination at The Line’s unprecedented scale.

Structural engineering presented the first major challenge. A 500-meter-tall, 200-meter-wide building stretching 170 kilometers creates structural forces that existing engineering frameworks struggled to address. Wind loading on a mirrored surface of that scale, thermal expansion and contraction across a 170-kilometer length, seismic considerations, and differential settlement of foundations across varying geological conditions all required solutions that pushed beyond established engineering practice.

The mirrored facade, while visually striking, created particular problems. A mirrored surface of that scale would create dangerous solar reflections—essentially acting as a massive parabolic mirror that could concentrate sunlight to damaging or even dangerous intensities. Managing this required either specialized coatings that reduced the mirror effect (undermining the design concept) or complex facade geometry that diffused reflections (adding enormous cost and complexity).

Thermal management within the structure was another critical challenge. In a climate where outdoor temperatures regularly exceed 50 degrees Celsius, maintaining comfortable interior conditions in a 500-meter-tall glass structure required cooling capacity of a magnitude never before attempted. The energy required for air conditioning alone threatened to overwhelm the renewable energy systems planned for the project.

Water supply and management for nine million people in one of the world’s most arid environments required desalination capacity exceeding that of any existing installation. The distance from coastal desalination plants to the inland portions of The Line added pumping costs and infrastructure requirements. The total water demand was estimated at approximately two billion liters per day—a figure that would have made The Line one of the largest single water consumers in the world.

The high-speed transit system, while technically feasible as an individual system, faced integration challenges within the confined space of a 200-meter-wide structure. The vibration, noise, and safety implications of running trains at 512 kilometers per hour through a occupied building required isolation and mitigation measures that consumed significant interior space and added substantial cost.

The Scaling Decision: How 170km Became 2.4km

The decision to scale The Line back to a 2.4-kilometer Phase 1 did not happen in a single dramatic moment. Rather, it emerged through a series of internal reviews, design iterations, and budget assessments that took place throughout 2024 and into 2025.

The first significant adjustment came when internal modeling suggested that achieving full occupancy of the 170-kilometer structure would require attracting a population larger than most major cities in the world, in a location with no existing economic base, limited cultural and social infrastructure, and extreme climate conditions. Even assuming success of Saudi Arabia’s broader economic diversification, the demand projections did not support a nine-million-person city in the NEOM zone within any realistic timeline.

The second adjustment followed from construction cost analysis. As detailed engineering progressed, cost estimates for the full structure climbed steadily above initial projections. The complexity of the foundation systems, the specialized materials required for the facade, the unprecedented mechanical and electrical systems, and the logistical costs of construction in a remote desert location all exceeded budget assumptions. By mid-2024, internal estimates suggested that the cost per linear kilometer of The Line was 40 to 60 percent higher than original projections.

The third adjustment was driven by timeline reality. Original plans called for significant portions of The Line to be completed by 2030, aligning with the Vision 2030 milestone. By 2024, it was clear that even the most aggressive construction schedule could not deliver more than a small fraction of the full structure by that date. The gap between the promised timeline and achievable reality was simply too large to bridge through schedule acceleration.

The combination of these factors led to the decision to focus on a 2.4-kilometer Phase 1 section near the coast. This section was chosen because it had the most advanced foundation work, was closest to existing infrastructure (including the NEOM Bay Airport and port facilities), and could be developed as a relatively self-contained community with access to coastal amenities.

The 2.4-kilometer length was not arbitrary. It represents the approximate distance that can be served by a single community center design, allowing Phase 1 to function as a coherent neighborhood with all essential services rather than a fragment of a larger system. The population target of 200,000 to 300,000, while a fraction of the original nine-million vision, would still make Phase 1 a significant urban development by any standard.

Phase 1 Design: What Is Actually Being Built

The Phase 1 section retains many of the original design principles but implements them at a more manageable scale. The mirrored exterior, the car-free interior, the integration of residential and commercial spaces, and the emphasis on walkability within a vertical community are all preserved. However, several significant design changes have been made to improve feasibility and reduce cost.

The height of the Phase 1 section has been reduced in some areas from the original 500-meter specification. While the overall profile maintains the dramatic visual impact, certain sections are designed at heights of 300 to 400 meters where the full 500-meter height was not structurally or economically justified. This reduction in height significantly reduces structural costs and simplifies the mechanical and electrical systems required.

The facade design has been modified to address the solar reflection concerns. Rather than a continuous mirror surface, the Phase 1 facade incorporates a pattern of mirrored and non-mirrored panels that preserves the overall visual effect while reducing problematic reflections. The non-mirrored sections incorporate photovoltaic elements, contributing to the building’s energy generation.

The interior layout has been redesigned to create more conventional urban spaces within the linear format. Rather than the highly integrated, technology-dependent systems originally planned, Phase 1 incorporates more traditional approaches to retail, dining, recreation, and public space that can function without the full suite of AI and automation systems originally envisioned.

The transit system for Phase 1 is a more conventional metro-style system rather than the high-speed rail originally planned for the full 170-kilometer route. At 2.4 kilometers, high-speed rail is unnecessary—the entire length can be traversed by conventional rail in minutes. This simplification eliminates some of the most challenging engineering requirements of the original design.

Cost Revisions: The New Financial Reality

The cost of the Phase 1 section is estimated at between $50 billion and $80 billion, depending on the final specification level and market conditions. While this is a fraction of the cost of the full 170-kilometer structure, it represents a significantly higher per-kilometer cost than originally projected, reflecting the front-loaded nature of many costs and the premium associated with delivering even a shortened version of such an unprecedented design.

The per-square-meter cost of Phase 1 is estimated at approximately $15,000 to $20,000—roughly comparable to ultra-luxury construction in cities like New York, London, or Hong Kong, but significantly higher than typical residential or mixed-use construction. This cost level has implications for the pricing of residential and commercial space within The Line, which must be set at levels that recoup the investment while remaining attractive to potential residents and tenants.

A significant portion of the cost base is sunk costs from the broader NEOM project. Foundation work, infrastructure, and site preparation that were originally undertaken for the full 170-kilometer route have been partially amortized against Phase 1, but much of this investment will not generate returns within the Phase 1 scope. The write-down of these costs, discussed in the broader NEOM analysis, represents a real economic loss.

Funding for Phase 1 is being provided primarily by the Public Investment Fund, but there is increasing emphasis on attracting private sector investment. Several international real estate developers and hospitality companies have been approached about investing in specific components of Phase 1, including hotels, retail space, and branded residential units. The response has been cautious, with potential investors seeking more certainty about the project’s timeline and the demand outlook for space within The Line.

Population Targets: Who Will Live in The Line?

The adjusted population target of 200,000 to 300,000 for Phase 1 raises fundamental questions about who will actually live in The Line and why. Attracting a population of this size to a new development in a remote location requires compelling reasons—economic opportunity, lifestyle appeal, or some combination of both.

NEOM’s strategy for populating Phase 1 appears to focus on several target demographics. Technology workers attracted by NEOM’s growing tech sector and the unique living environment. Hospitality and tourism workers serving the broader NEOM tourism ecosystem. Government and NEOM employees who are already working in the area. International professionals seeking tax-free income and a novel lifestyle. And affluent individuals attracted by the luxury positioning of The Line brand.

The challenge is that most of these groups have alternatives. Technology workers can work remotely from virtually anywhere. Hospitality workers typically cannot afford luxury living costs. Government employees can be directed to relocate but creating a vibrant city through bureaucratic mandate has limited appeal. International professionals have many competing destinations including Dubai, Singapore, and numerous other global cities. And affluent individuals have unlimited options for luxury living.

To address these challenges, NEOM is developing incentive packages that include subsidized housing, tax benefits, education and healthcare access, and lifestyle amenities. The unique nature of The Line itself—the opportunity to live in one of the most architecturally distinctive structures ever built—is also being leveraged as a marketing tool. Early interest, particularly from younger demographics attracted by the novelty factor, has been encouraging but has not yet translated into binding commitments at the scale required.

Construction Progress: Where Things Stand

As of early 2026, construction on Phase 1 is proceeding but at a pace that has been described by observers as measured rather than aggressive. The foundation work for the 2.4-kilometer section is substantially complete, with the massive concrete and steel substructure that will support the building above ground largely in place. This represents perhaps the most significant physical achievement of The Line project to date—a foundation system of unprecedented scale and complexity that demonstrates the project’s engineering capability.

Superstructure work—the construction of the building itself above foundation level—has commenced on the initial sections. Structural steel and concrete work is progressing floor by floor, though the current pace suggests that reaching the full height will take several years. The construction methodology combines conventional high-rise construction techniques with innovations developed specifically for The Line, including modular construction approaches designed to accelerate the process.

The facade installation has not yet begun in earnest, though prototype sections have been manufactured and tested. The mirrored facade system, which was purpose-designed for The Line, has undergone extensive testing for durability, thermal performance, and visual quality. The manufacturing supply chain for facade components has been established, with production facilities in Saudi Arabia and internationally.

Interior fit-out for the initial sections is in the planning and procurement stage. The design of residential units, commercial spaces, retail areas, and public amenities has been finalized for the initial phases, and contractors are being selected for the fit-out work. The pace of interior completion will ultimately determine when the first residents can move in.

Timeline Outlook: When Will People Move In?

The current timeline calls for initial occupancy of Phase 1 to begin in 2030, aligning with the Vision 2030 milestone, though this target is widely regarded as optimistic. More realistic assessments suggest that meaningful occupancy—defined as having residential units, basic services, retail, and community amenities operational—may not be achieved until 2032 or 2033.

The 2030 target date is politically important for Saudi Arabia, as it represents the culmination of the Vision 2030 reform program announced by MBS in 2016. Having some form of The Line operational by that date would provide a powerful visual symbol of the kingdom’s transformation. This political imperative may drive accelerated construction efforts as the deadline approaches, though the physical constraints of building a structure of this complexity set a floor on how fast construction can proceed.

The timeline is also dependent on factors outside NEOM’s direct control. Global supply chains for specialized construction materials, the availability of skilled labor in the required quantities, and the capacity of mechanical and electrical subcontractors to deliver the complex building systems required all represent potential bottlenecks. The experience of the broader construction industry suggests that delays in projects of this complexity are the norm rather than the exception.

The Broader Significance: What The Line Means Now

The scaling back of The Line from 170 kilometers to 2.4 kilometers represents a 98.6 percent reduction in length. This is not a minor adjustment—it is a fundamental transformation of the project’s nature. The Line was originally conceived as a new paradigm for urban development, a demonstration that cities could be built differently. At 2.4 kilometers, Phase 1 is more accurately described as a very large, very distinctive building—impressive by any standard, but not the civilization-changing project originally envisioned.

This transformation has implications for how The Line is perceived internationally. Critics argue that the scaling back validates their skepticism about the project’s feasibility from the outset. Supporters counter that Phase 1, if successful, could serve as the foundation for future expansion—that the 170-kilometer vision has been deferred, not abandoned. The truth likely lies between these positions: Phase 1 is a genuine achievement if completed, but the path from 2.4 kilometers to 170 kilometers remains extraordinarily challenging and uncertain.

For the architecture and engineering professions, The Line—even in its reduced form—has generated valuable knowledge. The engineering solutions developed for the project’s unique challenges, the construction methodologies tested, and the design innovations created have potential applications far beyond NEOM. The project has pushed the boundaries of what is considered possible in construction and urban design, and that knowledge persists regardless of how much of The Line is ultimately built.

For Saudi Arabia, The Line remains the most recognizable symbol of its modernization ambitions. The mirrored city in the desert has captured the global imagination in a way that no other Saudi project has. Even scaled back, The Line provides Saudi Arabia with a powerful brand asset—a symbol of ambition, innovation, and willingness to attempt the extraordinary. Whether that brand value can be maintained as the gap between the original vision and the built reality becomes more apparent remains to be seen.

Conclusion

The Line’s journey from 170 kilometers to 2.4 kilometers is ultimately a story about the collision between unlimited ambition and the immutable constraints of physics, economics, and human reality. It is a story that has played out many times in the history of megaprojects, from the Channel Tunnel to the International Space Station—projects that were conceived in one form and delivered in another, with the final product both more modest and more grounded than the original vision.

What makes The Line unique is the sheer magnitude of the gap between conception and execution. No project in history has been scaled back by 98 percent and remained viable. Whether Phase 1 can succeed on its own terms—as a distinctive, desirable, and economically sustainable urban development—is the question that will define The Line’s legacy. The answer will take years to become clear, but the early evidence suggests that a more modest, more realistic Line may yet prove to be a remarkable achievement, even if it falls far short of the dream that inspired it.