A 170-kilometre city. Mirrored buildings 500 metres high. Space for nine million people. Saudi Arabia’s The Line promised an extraordinary future—but turning that vision into reality exposed challenges that ambition alone could not solve.

In this documentary, Vault of Eras explores the construction behind NEOM’s most ambitious project. Follow the process from desert excavation and ground testing to deep bored piles, reinforced-concrete foundations and the infrastructure needed to support an enormous building site.

We also explore Oxagon’s port expansion, Trojena’s mountain dams and Sindalah’s island foundations—and examine how rising costs, changing priorities and difficult engineering decisions reshaped the wider development.

What was actually built? What remained a proposal? And what happens when the construction begins, but the original vision becomes harder to deliver?

Watch the story of the machinery, materials, people and decisions behind one of the world’s most ambitious construction programmes.

Would you continue building The Line, or use its foundations to create a different kind of city? Share your answer in the comments.

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Visuals include AI-generated reconstructions and architectural concepts.

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