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Secret chamber discovered inside Great Pyramid in Giza

Scientists have hailed it as the most important find since the 19th century.

The Great Pyramid is the sole survivor of the ancient Seven Wonders of the World.
The Great Pyramid is the sole survivor of the ancient Seven Wonders of the World. ScanPyramids mission/PA

A secret chamber has been found inside the Great Pyramid - and scientists are hailing it the most significant discovery since the 19th century.

The internal structure is located above the Grand Gallery - that links two of the pyramid's chambers - and traces a similar route for at least 30 metres.

Despite the breakthrough, the newly discovered structure has yet to be reached by any person.

It was detected using cosmic x-rays so researchers are still at a loss to what it was used for.

Researchers don't know what the chamber was used for as they haven't been able to get to it yet.
Researchers don't know what the chamber was used for as they haven't been able to get to it yet. ScanPyramids mission/PA

The Great Pyramid is the sole survivor of the Seven Wonders of the World.

Made under the watch of the Pharaoh Khufu and completed in around 2550 BC, it served as the world's tallest man-made construction for thousands of years.

How it was built has long been a bone of academic contention and there is no universal agreement about its creation.

How the pyramids were built has long been a bone of academic contention.
How the pyramids were built has long been a bone of academic contention. APTN

To find out more about the Pyramid, researchers from countries including France and Japan began a project to scan the structure in October 2015.

They employed by-products of the cosmic ray known as muons that are only partially absorbed by stone and take noticeably different trajectories through air.

Detectors were set up inside the Pyramid, including in the so-called Queen's Chamber.

This allowed the Pyramid's insides to be visualised without physically disturbing it, as the results showed empty space differently from rock.

The presence of the void, dubbed the ScanPyramids Big Void, was confirmed using three different muon detection technologies over several months after first being spotted.

Researcher Mehdi Tayoubi said: "This structure is not accessible, we don't see (that) people tried, if you look at the Grand Gallery, to access the void which is above.

"So this void was hidden, I think, since the construction of the Pyramid, it was not accessible.

"We needed this technique - the right technique at the right time - to be able to identify it and discover it."

He added they were "very confident" the results were correct.

The finding opens up the possibility that the void could be linked to other different and undiscovered structures within the Pyramid, the study published in the journal Nature claims.

Crucially, the authors said, it could provide a method by which scientists can finally start to piece together how the pyramid was built.

They added that the development "show how modern particle physics can shed new light on the world's archaeological heritage".

Muon detectors have previously been used to map out the inside of the Fukushima's nuclear reactor in Japan and it is hoped they can be used to explore other archaeological sites.

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