In March 2025, a team of researchers announced that radar analysis had revealed an enormous hidden complex beneath Egypt’s Pyramid of Khafre: shafts hundreds of metres deep, massive chambers, connecting structures and a network supposedly extending roughly two kilometres beneath the Giza Plateau. The claim went viral before it had been independently peer-reviewed, tested on the ground or published in a scientific journal. Zahi Hawass called it “fake news” and said there was no scientific basis for the alleged structures. Radar specialists argued that the claimed depth was physically incompatible with the technology being described. Now, more than a year later, an even more consequential development has arrived: the journal Remote Sensing has formally retracted a 2022 paper by two of the same researchers, stating that an editorial investigation found “serious methodological flaws and statistical errors” that undermined its scientific conclusions.
That does not mathematically prove that every feature claimed beneath Khafre is nonexistent. Science rarely works by proving a negative at that level. It does something more useful: it asks whether the method can actually support the conclusion being drawn from it. In this case, the answer has become increasingly difficult to defend. The 2025 underground-city announcement remains unpublished and independently unverified, while the earlier peer-reviewed study that helped establish the researchers’ credentials in this area has now been withdrawn by the journal that published it. What looked in 2025 like a spectacular archaeological discovery now looks much more like a case study in what happens when extraordinary imagery outruns the instrument, the methodology and the evidence.
First, Get the Pyramid Right
The viral story was not about a newly discovered structure beneath some unknown pyramid. It was about the Pyramid of Khafre, the second-largest of the three major pyramids at Giza. Some versions of the story even mislabeled the location as “Hebron,” an obvious geographical error. The original announcement emerged in March 2025, with the researchers presenting their claims publicly rather than unveiling a completed archaeological excavation or a conventional peer-reviewed discovery.
What the Researchers Actually Claimed
The researchers associated with the Khafre Project were Filippo Biondi, a remote-sensing researcher associated with the University of Strathclyde, Corrado Malanga of the University of Pisa, and Armando Mei. They said they had developed a novel way of processing Synthetic Aperture Radar data that allowed them to infer structures beneath the pyramid and surrounding plateau. Their public presentation described eight enormous cylindrical features extending to roughly 648 metres, spiral-like structures surrounding them, large cube-shaped structures and interconnected pathways. The broader interpretation suggested an underground complex extending for roughly two kilometres, which quickly became described online as a hidden city beneath Giza.
The imagery was spectacular. That was also part of the problem. A rendered three-dimensional structure can look remarkably like a photograph of something that has actually been observed. But a scientific image is not automatically a photograph of reality. Between a physical measurement and a three-dimensional reconstruction there can be calibration, filtering, modelling assumptions, statistical processing and interpretive choices. Each step can increase the distance between what the instrument directly measured and what the final picture appears to show.
That distinction became critical here. The public was shown structures. What the underlying technique had actually demonstrated, and whether it could demonstrate structures at the claimed depths, was the question that needed to be answered first.
Hawass Did Not Say “Wait for the Excavation.” He Rejected the Premise.
Zahi Hawass, Egypt’s former minister of antiquities and one of the world’s best-known Egyptologists, responded almost immediately. In a statement about the Khafre claims, he described the reports as “fake news” and said the alleged discovery had no scientific basis. He also emphasized that Egyptian authorities had not granted permission for the researchers to conduct the claimed radar work inside or outside the pyramid. Hawass specifically stated that no radar devices had been used inside Khafre and rejected the reports of columns and underground structures beneath the monument.
Hawass’s authority should not be treated as a substitute for evidence. An archaeologist saying a discovery is wrong does not, by itself, settle a technical question. But his objection was not standing alone. Independent radar specialists and archaeologists were questioning the method from entirely different directions. That convergence is important because it means the criticism was not simply a clash between “mainstream archaeology” and an unconventional interpretation. It included a direct challenge to whether the physical measurement technique could produce the claimed result in the first place.
The Radar Problem Is the Heart of the Story
Lawrence Conyers, a University of Denver specialist in the archaeological use of radar, directly challenged the interpretation. His criticism was not simply that the structures sounded implausible. It was that satellite-based Synthetic Aperture Radar does not possess the ability to penetrate hundreds or thousands of metres of solid geological material and return detailed information about complex structures at those depths. Conyers characterized the “underground city” interpretation as a huge exaggeration while allowing that smaller and shallower archaeological features could plausibly exist beneath the plateau.
Archaeologist and Egyptologist Sarah Parcak raised a related objection to the interpretation of satellite imagery, arguing that SAR does not simply function as a subterranean camera capable of looking through rock. Her criticism went further: heavily processed imagery can produce visually persuasive patterns that invite interpretations not justified by the original measurements. That is an especially important warning in an era when a spectacular rendering can travel around the world long before anyone has inspected the underlying data.
The distinction between detection and interpretation is therefore crucial. Remote sensing is extraordinarily powerful. It can reveal changes in Earth’s surface, vegetation, moisture, subsidence and other physical properties without excavation. Archaeologists routinely use remote sensing to locate features invisible from the surface. But that does not mean every processed image is a direct map of whatever structure a researcher believes might be underground. The deeper and more elaborate the claimed structure, the more demanding the validation has to become.
And There Was No Independent Archaeological Confirmation
The 2025 Khafre announcement did not come with an excavation that exposed the alleged shafts. It did not come with drilling that intercepted one of the supposed chambers. It did not come with an independent geophysical survey reproducing the same structures. It did not come with a peer-reviewed paper in a scientific journal describing the complete methodology and allowing specialists to test the analysis. Instead, the public received a dramatic interpretation of remote-sensing data and a press campaign surrounding it.
That distinction is not pedantic. Archaeology is full of things that appear to exist in remote-sensing data and disappear when examined on the ground. Conversely, genuine discoveries can begin as anomalies in remote sensing and later survive independent testing. The difference is replication. If an enormous underground complex really exists beneath Giza, there are multiple ways its physical existence could eventually be demonstrated. A second independent sensing technique could find it. A borehole could intersect it. Excavation could expose it. Other researchers could reproduce the signal. A published dataset could allow specialists to test the analysis.
None of that happened for the spectacular Khafre claim.
Then Came the Detail That Changes the Story in 2026
When the Khafre claims first circulated, one fact gave the story an appearance of scientific legitimacy: Biondi and Malanga had previously published a peer-reviewed paper in Remote Sensing. The October 2022 paper was titled “Synthetic Aperture Radar Doppler Tomography Reveals Details of Undiscovered High-Resolution Internal Structure of the Great Pyramid of Giza.” It concerned the Great Pyramid of Khufu, not Khafre, and it made a considerably more limited claim about internal structures. The existence of that publication meant the researchers were not simply anonymous internet personalities presenting a theory. They had published scientific work in a recognized journal.
Then, on August 10, 2026, Remote Sensing retracted the paper.
The reason given by the journal is unusually consequential. After a reader raised methodological concerns, the journal’s editorial office and board conducted an investigation. The journal says that investigation “confirmed serious methodological flaws and statistical errors” that were judged to undermine the scientific conclusions of the paper. The retraction was approved by the journal’s editor-in-chief. Biondi and Malanga were informed and disagreed with the decision.
That wording matters. A retraction is not simply a later researcher saying, “I don’t like this paper.” It is the journal formally withdrawing confidence in the published article because it concluded that problems with the methodology and statistics undermined its conclusions. The original 2022 paper remains part of the historical record, but it can no longer honestly be presented as an intact peer-reviewed foundation for claims about hidden structures inside the pyramids.
But Do Not Confuse Khufu With Khafre
This is where sloppy reporting can accidentally make the case weaker. The retracted paper was about the Pyramid of Khufu, the Great Pyramid. The spectacular March 2025 announcement was about Khafre, the second pyramid. The two claims are related because they involve the same researchers and a similar radar-based methodology, but the 2022 paper did not itself discover the alleged two-kilometre-deep city beneath Khafre.
The correct argument is therefore not “the Khafre underground city was retracted.” It wasn’t. The correct argument is more precise: the 2025 Khafre claims remain unverified and unpublished, while the earlier peer-reviewed Khufu study by two of the same researchers has now been formally retracted because the journal found serious methodological and statistical problems. That does not prove the 2025 interpretation false by itself. It does, however, remove an important piece of apparent evidentiary credibility that existed when the story first went viral.
The People Behind the Claim Matter, But the Method Matters More
Corrado Malanga’s public record includes a long history of fringe claims involving extraterrestrials and alleged alien-abduction phenomena. That history is relevant when assessing the broader context in which the Khafre story was presented, particularly because some of the later interpretations moved beyond archaeology into ideas about lost civilizations and ancient technological systems. But a person’s other beliefs are not a scientific refutation of a particular experiment. The method still has to be tested on its own merits.
In this case, that is precisely where the story is weakest. The 2025 interpretation was not independently validated, its spectacular depths were challenged by specialists in radar, and the earlier peer-reviewed study by Biondi and Malanga has now been retracted for methodological and statistical problems. The evidence does not become stronger because one of the researchers has unusual beliefs, nor does it become weaker merely because an establishment figure dislikes the conclusion. It becomes weaker because the evidentiary chain itself has failed to withstand scrutiny.
The Younger Dryas Is a Completely Different Question
Another source of confusion is the tendency to bundle the Khafre claim together with legitimate but controversial questions about catastrophic events in prehistory. The Younger Dryas impact hypothesis is one such example. Geologist James Kennett and other researchers have argued that a cosmic impact or airburst event around 12,800 years ago may have contributed to abrupt environmental changes associated with the beginning of the Younger Dryas.
That hypothesis has been debated extensively. Whatever position one takes on it, however, it is not evidence for a hidden city beneath Khafre. There is no legitimate logical bridge from “a cosmic event may have affected Earth in the late Pleistocene” to “therefore a 38,000-year-old technological complex exists beneath the Giza Plateau.” One is a geological hypothesis supported and challenged through scientific literature. The other is an archaeological claim requiring its own evidence.
Alternative Archaeology Is Not the Same Thing as Archaeology
Graham Hancock, Andrew Collins and other alternative-history writers have helped popularize ideas about lost civilizations, forgotten cataclysms and hidden structures beneath Giza. They are real authors whose arguments can be examined. But their interpretations should not be silently converted into archaeological consensus. Egyptian temples, myths and symbolic texts can be fascinating without being literal records of technologically advanced civilizations that existed tens of thousands of years ago.
The same distinction applies to Göbekli Tepe and Karahan Tepe. These sites really did transform our understanding of Neolithic societies in the Near East. Their monumental architecture is astonishing. Their chronology is important. Their builders were capable of organizing large-scale communal projects long before conventional assumptions about the rise of complex societies. None of that requires a lost global civilization to explain it. In fact, the genuinely established archaeology is remarkable precisely because it shows what ancient human societies were capable of doing.
The Irony Is That Real Remote Sensing Has Already Found Extraordinary Things at Giza
There is an important reason these stories spread so easily: remote sensing really has transformed pyramid archaeology. Scientists have discovered genuine previously unknown features inside the Great Pyramid using muon tomography, a completely different technique based on naturally occurring cosmic-ray particles passing through matter. The ScanPyramids project identified the enormous “Big Void” inside Khufu and later work revealed the previously unknown North Face Corridor. Those discoveries did not require a speculative two-kilometre subterranean civilization. They required a physical measurement technique whose limitations and strengths could be independently understood.
That contrast is revealing. Real archaeology can produce discoveries that sound like science fiction. The Great Pyramid actually does contain structures that researchers did not know about before modern technology was applied to it. But the discoveries became convincing because independent teams could analyze them, the physics was understood, the signals were measurable and the interpretations could be tested. The lesson is not that “nothing mysterious exists beneath the pyramids.” The lesson is that mystery becomes knowledge only when the measurement survives scrutiny.
What the 2026 Retraction Actually Changes
The retraction does not allow anyone to write, “Scientists have proved there is nothing underground at Giza.” That would simply replace one overstatement with another. Giza contains known underground structures, chambers, shafts, quarries and other archaeological features. New discoveries remain possible. The plateau is not scientifically exhausted.
What the retraction changes is the evidentiary status of one particular line of argument. A 2022 paper that had been used as evidence that the researchers possessed a credible technique for reconstructing hidden pyramid structures has now been formally withdrawn. The journal did not say that the paper was merely controversial. It said an investigation found methodological flaws and statistical errors serious enough to undermine its conclusions.
That makes the 2025 Khafre announcement harder, not easier, to defend. The later claim was already missing the normal safeguards of peer review and independent confirmation. Now the earlier publication by two of the same researchers has lost its status as a reliable scientific result. The extraordinary underground city therefore has to stand almost entirely on the extraordinary interpretation that produced it.
The Pyramid Does Not Need an Underground City to Be Astonishing
There is a temptation, especially in stories about ancient Egypt, to believe that rejecting the spectacular claim means defending a boring version of history. It does not. The actual history of Giza is extraordinary enough. The pyramids were engineered, quarried, transported and assembled by human societies more than four thousand years ago. Their builders understood geometry, logistics, surveying, stoneworking and large-scale organization at levels that still fascinate modern engineers and archaeologists.
And there really are things beneath and inside Giza that we do not yet understand completely. That is not an invitation to believe every image circulating online. It is an invitation to investigate the anomalies properly.
The Difference Between a Discovery and a Picture of a Discovery
The Khafre story exposes a modern problem that goes far beyond Egypt. We increasingly live in a world where scientific instruments generate enormous amounts of data and software can transform that data into images that look intuitively real. A three-dimensional rendering feels like an object. A heat map feels like a structure. A probability surface feels like a landscape. Once an image is published, the reader can easily forget that the picture is the end product of a chain of assumptions.
That is why methodology matters more than spectacle. What did the instrument actually measure? How deep can it physically penetrate? What assumptions were used to reconstruct the signal? Were alternative explanations tested? Can independent researchers reproduce the result? Has another technique detected the same structure? Has anything physical been found where the model says it should be?
Those questions are not obstacles placed in front of a discovery. They are the machinery that turns a claim into a discovery.
The Real Story Is Now More Interesting Than the Viral One
In 2025, the headline was a hidden city beneath the Pyramid of Khafre. It was an irresistible story: ancient Egypt, secret chambers, enormous shafts, mysterious technology and a civilization buried beneath the civilization we thought we knew. But the evidence never reached the standard required to establish that story as archaeology. Hawass rejected it. Radar specialists challenged the physics. Archaeologists questioned the interpretation. The supposed structures were not independently excavated or confirmed. And the 2025 claim itself never became a peer-reviewed scientific discovery.
Then 2026 supplied something the original story did not have: an institutional scientific verdict about an earlier piece of the researchers’ work. Remote Sensing investigated the 2022 paper by Biondi and Malanga and concluded that serious methodological flaws and statistical errors undermined its conclusions. The paper was formally retracted. The authors disagreed with the decision.
That is not proof that every unexplained feature beneath Giza is imaginary. It is something more precise, and more devastating to the original headline. The extraordinary Khafre claim was never established in the first place, and the scientific foundation most naturally cited in its defense has now been formally withdrawn.
The pyramids still have secrets. But a spectacular rendering is not one of them until the rock itself agrees.
And if there really is a vast underground structure beneath Khafre, the way to make history will not be another viral image. It will be independent measurements, reproducible analysis and physical evidence that survives every attempt to prove it wrong.
Until then, the underground city remains a claim, not a discovery.
