This 4,500-year-old pyramid is the oldest and largest of the three monuments on the Giza Plateau and is believed to be Pharaoh KhufuThe ScanPyramids project was launched to provide several non-invasive and non-destructive technologies to better understand its structure, construction process and technology. It made a breakthrough in 2016 when it discovered a previously unknown hole on the north side of the pyramid.

A year later, experts announced that they had discovered the “Big Void”, an unknown space 30 meters high above the large gallery.

Mehdi Tayoubi, the co-director of the project, said at the time: “We don’t know whether this huge gap is horizontal or inclined.

“We don’t know whether this gap is made up of one structure or several continuous structures.

“What we can be sure of is that this great void is there, which is impressive, and as far as I know, no theory has anticipated this.”

As Egypt lifts COVID-19 restrictions, this situation may change.

What made this amazing feat possible at the time was a revolutionary technology called muon tomography, which allowed scientists to explore previously inaccessible locations.

Muons are elementary particles, similar to electrons, but 200 times heavier.

Compared to other types of radiation (such as X-rays or gamma rays), being so heavy and traveling so fast allows them to penetrate dense matter.

But unlike X-rays and gamma rays, cosmic ray muons do not damage the materials through which they pass.

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The latest issue of the BBC Science Focus magazine details how the continuous muon tomography of the Pyramid of Khufu revealed more of the smaller cavities discovered in 2016 before work was suspended due to the pandemic.

It implies that it is “a corridor extending at least five meters to the pyramid, possibly sloping upwards.”

This also caused the size of the “Great Void” to be recalculated as “at least 40 meters long.”

The BBC added: “If the global promotion of the COVID-19 vaccine goes according to plan, work on the ScanPyramids project and other projects may resume soon.

“When it happens, more secrets hidden in some of the world’s oldest natural and man-made structures may begin to reveal.”

The results of the previous investigation received great media attention at the time, but some experts expressed doubts about it.

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Egyptologist Dr. Chris Naunton previously told Express.co.uk: “This story comes quickly and goes very quickly.

“This new technology has the potential to show us interesting things.

“However, my colleagues know these pyramids very well, and their answer is,’We have always known that there are holes.’

“It’s very exciting, but it doesn’t make our understanding go too far.

“We can speculate about what the cows might be before they go home, but there is no way to prove it.

“I don’t know if the project stopped because it accomplished what they planned to do, or if they were discouraged by the reaction.”