Breaking: Scientists discover giant void hidden in the Great Pyramid of Giza

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For millennia, a towering wonder – the Great Pyramid of Giza – was the tallest human-made structure on Earth, and as the long centuries passed, it forever held onto a hidden secret. Until today.

Scientists have just reported the discovery of a giant void hidden in this largest of Egyptian pyramids, aka Khufu’s Pyramid. While we don’t yet know what purpose this chamber or hall served, the sheer size of the space suggests it plays an important role in the ancient pharaoh’s tomb – maybe even his afterlife too.


An international team of researchers involved with the ScanPyramids project detected the hidden void in investigations that date back to 2015.

The same research team previously uncovered thermal anomalies in the Great Pyramid’s structure, and also conducted an analysis of Egypt’s Bent Pyramid south of Cairo, which enabled them to map its internal structure.

The void, above the inclined Grand Gallery (ScanPyramids)

Here, the researchers implemented the same kinds of techniques – non-invasively imaging the Great Pyramid’s insides by using muons: by-products of cosmic rays that are only partially absorbed by stone.

This method, called muon radiography, works kind-of like an X-ray, as the muons bounce around inside the structure and provide an outline for a 3D reconstruction of the space. This sets it apart from infrared thermography, which detects temperature variations inside a structure.

It might sound like science fiction, but it’s actually an imaging method that’s been used for decades, only the ScanPyramids team has equipment with much higher sensitivity at their disposal.


Using three different kinds of muon detection techniques – involving both devices installed inside the Great Pyramid (within the Queen’s Chamber) and outside it – the researchers identified the large hidden void, which they say is the first major inner structure discovery in the Great Pyramid since the 19th century.

Located above the Grand Gallery – the largest known chamber in the pyramid up until now – the void is estimated to be at least 30 metres (98 feet) long, with a cross-section similar in size to the Grand Gallery underneath it.

821 great pyramid void 3The Grand Gallery (ScanPyramids)

“While there is currently no information about the role of this void, these findings show how modern particle physics can shed new light on the world’s archaeological heritage,” the authors write in their paper.

At present, the ScanPyramids researchers are unwilling to speculate on what the void may represent in terms of its architectural and historical significance, but they’re hoping that their discovery will give Egyptologists the raw data to explain what this chamber – or perhaps series of smaller, connected chambers – could represent.

There’s still a lot we don’t know, the team acknowledges. For starters, it’s yet unclear whether the giant void is built level with the ground, or inclined at an angle similar to that of the Grand Gallery below it.


Before more is known, the team hesitates to hypothesise further, not wanting to add to the swirl of unfounded speculation that has always surrounded pyramid research.

“There are so many theories about how the pyramids were built. There are so many theories about potential hidden chambers, but the problem is that those theories are only theories,” the team explained at a conference announcing the results.

“That’s why when we designed this mission… we wanted to be agnostic in terms of theories. We have new technology… let’s use it without any a priori [theory] and see what’s inside this pyramid.”

821 great pyramid void 3The void’s location, if not inclined (ScanPyramids)

The researchers say more research is being conducted now – and more announcements will be on their way soon – but until those new findings are shared, there’s one thing the researchers will admit: this strange void didn’t get there by chance.

“When you know the pyramid, and you know the perfection of the pyramid, it’s very strange to imagine, that [the void resulted by] accident.”

The findings are reported in Nature.


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