Ambitious, controversial, and startlingly futuristic in its design, the city of Neom was intended to drastically change the future of Saudi Arabia, helping the country diversify beyond its oil-dependent economy.

Now, plans for the uniquely striking metropolis have been scaled back considerably, with spiralling costs and mounting delays meaning the extortionate project may well now be "far smaller" in scale. Launched by Crown Prince Mohammed bin Salman, with an eyewatering budget of £365bn, the £6.8tn mega-city was initially given a deadline of 2030, with the most striking feature set to be The Line.

In a design straight out of a sci-fi film, The Line was intended to be a row of mirror-clad skyscrapers, stretching 125 miles across the desert, and connected by leafy walkways. Reaching a half-kilometre into the sky, these bold structures were intended to accommodate some nine million residents, meeting the needs of a country whose booming population of 35 million is now outgrowing existing cities.

• Huge £6.8tn mega-city spanning 125 miles of desert faces massive issue

Built on just 34 square kilometres, these properties were designed with "a reduced infrastructure footprint" in mind, "creating never-before-seen efficiencies in city functions". According to the Neom website, "The ideal climate all year round will ensure that residents can enjoy the surrounding nature. Residents will also have access to all daily essentials within a five-minute walk, in addition to high-speed rail, with an end-to-end transit of 20 minutes."

Unfortunately for Saudi Arabia, which has already poured billions into this project, the practical realities of such an endeavour have hampered the original vision, and it's believed construction could now be significantly cut back.

As reported by The Times, the Crown Prince has grown increasingly frustrated about delays to his grand plan for diversifying the nation's economy over the course of the next decade, and has already postponed or scrapped various other projects.

Now, the de facto ruler has ordered a reevaluation of Neom, which he has previously hailed as a way to "tackle the challenges facing humanity in urban life today" and to "shine a light on alternative ways to live". It's thought likely this lofty mission will now change tack somewhat, focusing on smaller-scale goals such as artificial intelligence data centres.

One source familiar with the ongoing matter told the publication that this review is still in progress, and that it is not currently clear whether or not The Line would continue on as a more modest, manageable project.

Neom was initially envisioned as including a 6,500 square kilometre nature reserve, alongside the mountainous retreat Trojena, anticipated to feature Saudi Arabia's debut outdoor ski slopes, freezing winter conditions and a "moderate year-round climate".

However, while Trojena had originally been scheduled to welcome the 2029 Asian Winter Games, officials have acknowledged it won't be completed on time. Indeed, at the time of writing, the only part of the project to open so far is the Red Sea yachting resort of Sindalah, widely regarded as a costly failure, which ultimately led to the firing of Neom's chief executive.

The extravagant launch party, which saw 40 private yachts docked at the resort, while guests were treated to performances from Will Smith and Alicia Keys. Crown Prince Mohammed reportedly wasn't pleased by the outcome, however, and had questions about the steep price tag.

The Mirror has reached out to Neom for comment.

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