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THE "insane" £1.5billion Bernabeu renovation included a hidden network of underground tunnels and setting FIRE to the old roof.

And the epic project even required a full year-long study of the sun to avoid blinding drivers.

Aerial view of the completed Santiago Bernabéu Stadium in Madrid.
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The new look Bernabeu is a thing of beautyCredit: Real Madrid
Trays of grass being moved from a football field into the stadium's hypogeum.
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The complex model is a first for football infrastructureCredit: Real Madrid
Interior view of the Hypogeum showing six plates/trays used for pitch storage.
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The underground greenhouse features six levelsCredit: National Geographic
Molten metal being poured in a factory.
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There was plenty of fire in the operation - from creating the steel facade to burning the old roofCredit: National Geographic/Josep Serra
Excavation of a stadium's logistics tunnel.
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Tunnels underneath the stadium allowed machinery to drive aroundCredit: National Geographic
Empty stadium before a Real Madrid and AC Milan soccer match.
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The finished article has fans and players alike in aweCredit: Getty

Real Madrid spent a fortune updating their iconic stadium, finally completing the work in 2024.

Much has been made of the brand-new features such as the 360-degree LED scoreboard screen, the sleek steel facade and the flagship VIP hospitality suite, the SkyBar.

The pitch has also been split into six panels which are split up and stored in an underground greenhouse hypogeum, only coming out for matchday, in one of the most advanced pieces of architecture in world football.

Now, though, the reality of the sheer logistical ingenuity and complexity of the Bernabeu facelift has been revealed.

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A documentary - Megastructures: Real Madrid Super Stadium - followed the mammoth project, which was ironically massively helped by the Covid pandemic.

That is because Real Madrid were insistent that they would keep on playing at the Bernabeu for their domestic matches throughout the construction work.

As a result, the pitch was out of bounds to protect the playing surface while all the heavy machinery had to be stored away to meet safety regulations with 80,000 fans in attendance - although the cranes made for surreal aerial viewing spots for a lucky few.

So part of the early stages of the work involved digging tunnels beneath the stadium to allow the diggers to be stored and get to different areas of the site easily.

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But the issue with needing to keep the pitch clear meant work on the roof was particularly tricky as the team had to avoid it at all costs - essentially operating like work on a bridge over water.

One of the earliest stages of the renovation included dismantling the old partial roof to remove it and make way for the new state-of-the-art roof.

Real Madrid release amazing time lapse footage of Bernabeu construction work as retractable roof is added

And that involved setting sections ablaze in staggering scenes.

Once the existing roof was completely removed, the delicate process of constructing a frame for the new roof took place.

Incredibly, the modern retractable roof weighs the same as two Eiffel Towers.

And there is even an inflatable pad within the machinery - carefully programmed alongside the rest of the aeronautical roof - which makes it fully waterproof.

When the Covid pandemic worsened and Spain went into lockdown, the 2019-20 football season was put on pause.

But for the workers, they got the green light to carry on - and carry on they did, with a non-stop day-and-night operation in full swing.

A person uses a machine to maintain a large indoor field of artificial turf at the Santiago Bernabéu Stadium.
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The Bernabeu pitch is stored underground in six piecesCredit: National Geographic/Josep Serra
Santiago Bernabéu Stadium construction: field preparation.
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The Covid pandemic allowed the old pitch to become a building siteCredit: National Geographic/Josep Serra
Workers installing a large scoreboard screen at the Santiago Bernabéu Stadium.
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The 360-degree LED screens are a wonderful additionCredit: National Geographic/Josep Serra
Construction worker operating a lift to place metal structures in a stadium hypogeum.
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The hypogeum is 23m deepCredit: National Geographic/Josep Serra
Workers installing metal facade slats on the Santiago Bernabéu Stadium.
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The 13,200 slats were each manufactured uniquelyCredit: National Geographic/Josep Serra
Grounds manager inspecting grass at Santiago Bernabéu Stadium.
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Some academy players had a kick about on the jigsaw-style pitch at the training groundCredit: National Geographic/Josep Serra

And, crucially, no matches enabled them to rip up the luscious green pitch and convert it into a building site.

That paved the way for work to begin on the revolutionary system, digging down a whopping 23 metres below the surface to create six levels in the ultimate game of underground football pitch Tetris.

A replica pitch using the same technology had been designed at Los Blancos' training ground using their custom agronomic laboratory to build the replicated 'pieces' structure, first tested out by several academy young stars.

Real Madrid had two objectives: they wanted the very best turf in the world and they wanted to be able to store it away when not in use to make the Bernabeu into a money machine able to host events - such as Taylor Swift concerts - whenever there was no match.

Simples. Or not.

The finishing touches to the new version of the Bernabeu - ironically the first thing fans will notice arriving - came with the stunning exterior.

A whopping 13,200 slats of uniquely-designed steel were all individually manufactured to create the striking appearance.

But even the steel wraparound required detailed research lasting a full 365 days - aka a full orbit of the sun.

Because the architects, designers and safety officers had to ensure it was safe.

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The metallic exterior catches the sun and therefore they were required to make sure the positioning and intensity of the bright reflections would not get dangerously hot nor startle and blind drivers using the roads around the ground or get too hot.

Make no mistake about it, the new Bernabeu is a piece of sheer design absurdity and creativity to utterly bonkers proportions - but would you expect anything less from Real Madrid Club de Futbol?

Santiago Bernabéu Stadium under renovation.
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The new roof structure weighs the same as two Eiffel TowersCredit: National Geographic/Josep Serra
Construction of a stadium roof using large cranes.
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Being unable to work on the pitch initially meant workers used bridge-building techniquesCredit: National Geographic
Excavation of the hipogeum at the Santiago Bernabéu Stadium in Madrid, Spain, has reached the sixth level.
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The operation was captured by National Geographic's camerasCredit: National Geographic/Josep Serra
Slabs being installed at the Santiago Bernabéu Stadium in Madrid.
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The entire project cost approximately £1.5billionCredit: National Geographic/Josep Serra
Renovations underway on a stadium's playing field.
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The major work was completed in 2024Credit: National Geographic
Workers connecting two 500-ton sections of a stadium's mega-truss.
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Two 500-ton sections of the mega-trusses had to be perfectly alignedCredit: National Geographic
Four men raking a soccer field at the Santiago Bernabéu Stadium.
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The greenhouse creates the perfect environment for the grassCredit: National Geographic/Josep Serra
Construction manager overlooking Santiago Bernabéu Stadium at night.
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Some workers were able to watch matches from cranes early onCredit: National Geographic/Josep Serra
Interior view of the Santiago Bernabéu Stadium in Madrid showing the retractable playing field.
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The pitch only comes out on matchdaysCredit: National Geographic/Josep Serra
Construction manager overseeing the installation of a retractable roof section at night.
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Work continued through the night for several stagesCredit: National Geographic/Josep Serra
Worker installing metal plates on a stadium facade.
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The facade exterior features a striking steel wraparound designCredit: National Geographic/Josep Serra
Large crane lifting a retractable roof section at a stadium.
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The cranes and machines had to be stored away while matches continuedCredit: National Geographic/Josep Serra
Santiago Bernabéu Stadium renovation: facade slats being installed.
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A year-long sun study was required to ensure drivers would not be blindedCredit: Real Madrid
Aerial view of the completed Santiago Bernabéu Stadium in Madrid.
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The retractable roof is fully waterproof thanks to an inflating padCredit: Real Madrid
Gardener mowing lawn indoors.
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Groundstaff work on the pitch undergroundCredit: National Geographic
Workers installing a retractable stadium roof.
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The aeronautically roof is precisely programmedCredit: National Geographic/Josep Serra
Technician operating machinery on a field of artificial turf in a climate-controlled laboratory.
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A replica pitch was also created at the agronomy laboratory across townCredit: National Geographic/Josep Serra
A scientist examines grass under LED lights in a laboratory.
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Real Madrid were insistent they wanted the very best turf in the worldCredit: National Geographic/Josep Serra
Construction workers renovating the Santiago Bernabéu Stadium's playing field.
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The Bernabeu played host to Taylor Swift during her Eras tourCredit: National Geographic/Josep Serra
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