Scans found two hidden voids tucked behind the smooth face of the Menkaure pyramid.

The Giza plateau has been picked over by archaeologists, surveyors and treasure hunters for more than two centuries, and the assumption for most of that time was that its three great pyramids held few remaining surprises above ground. The smallest of the trio, built for the Fourth Dynasty pharaoh Menkaure roughly 4,500 years ago, seemed especially well documented, its granite and limestone casing mapped stone by stone by generations of Egyptologists.

That assumption has now been complicated by a new round of non-invasive imaging, which found two cavities tucked just behind the pyramid’s outer face that do not appear on any existing survey. Neither space has been opened or entered. Both were detected purely through instruments capable of reading what lies beneath solid rock without disturbing a single block.

A New Look at an Old Monument

The team behind the discovery combined several non-destructive scanning methods, including ground-penetrating radar, ultrasonic tomography and electrical resistance tomography, to probe the monument’s masonry from the outside. Each technique reads a different physical property of the stone, from how sound waves bounce off buried surfaces to how electrical current behaves when it hits an air pocket, and researchers cross-checked the results against one another before concluding that two genuine voids were present, according to Newsweek. The combination is designed to rule out false positives, a persistent hazard in subsurface archaeology where cracks, mortar gaps or natural fissures can mimic the radar signature of a hollow chamber.

Menkaure’s pyramid has always been the runt of the Giza set, standing a little over 200 feet tall compared with the roughly 450-foot bulk of the Great Pyramid built for Khufu. Its comparatively modest size has made it easier to study in full, which is part of why the new findings caught researchers’ attention. A monument this thoroughly surveyed was not expected to still be hiding structural features.

Two Cavities Behind the Casing

The scans placed the cavities at shallow depths, just a few feet behind the pyramid’s outer casing stones on its eastern face. One void sits roughly 4.6 feet in from the surface and measures a little over three feet high by nearly five feet wide. The second is smaller and slightly deeper, closer to 3.7 feet behind the facade and under three feet tall. Both register as air-filled rather than packed with rubble or debris, which is part of what distinguishes a genuine void from ordinary construction gaps between courses of stone.

Researchers involved in the survey have been careful to describe the findings as anomalies rather than confirmed chambers or passageways. Air-filled does not automatically mean man-made, and pyramid interiors are known to contain small construction voids left over from the original building process nearly five millennia ago. What makes these particular cavities worth a second look is where they sit and what else lines up with them.

A Decades-Old Clue in the Masonry

The eastern face of Menkaure’s pyramid carries a detail that has puzzled Egyptologists for years: a band of finely polished casing stones. Elsewhere on the monument, that kind of high-grade polishing is found only on the pyramid’s documented northern entrance, the point where visitors and ancient robbers alike have long known they could pass into the interior. Finding the same treatment on the east side, with no corresponding opening ever identified there, led one researcher, Stijn van den Hoven, to propose back in 2019 that the eastern face might conceal a second, undiscovered entrance.

The newly detected voids sit close to that same polished section, and the survey team has framed the finding as the first direct physical evidence supporting van den Hoven’s older hypothesis. It is not proof of a passage. It is, at best, a data point that finally gives the idea something concrete to point to after years of resting on a visual clue in the stonework alone.

Caution Before the Celebration

Pyramid research has a long history of premature excitement over “voids” that later proved to be structurally unremarkable. The Great Pyramid’s own “Big Void,” identified by cosmic-ray muon scanning in 2017, generated years of speculation about a hidden chamber before researchers settled on more conservative interpretations of its purpose, and no excavation has yet resolved exactly what it is. The Menkaure findings are being treated with the same caution. Confirming whether either cavity is a genuine passage, a burial-related space, or simply an artifact of ancient construction will likely require follow-up work such as micro-drilling for an endoscopic camera, a far less invasive step than full excavation but still one that requires Egyptian antiquities approval before it can proceed.

For now, the discovery adds a fresh thread to one of archaeology’s most examined sites without resolving it. It also underscores how much modern geophysical tools have changed pyramid research over the past decade, turning monuments once thought fully mapped into subjects of renewed scanning, block by block, in search of what earlier generations of surveyors had no way to see.

Why Menkaure’s Pyramid Was Overlooked for So Long

Part of the reason Menkaure’s pyramid drew less scanning attention than its larger neighbors for so long comes down to scale and spectacle. Khufu’s Great Pyramid has dominated public fascination and research funding for two centuries, and Khafre’s pyramid, the middle of the three, retains a distinctive cap of original casing stone near its summit that has made it a frequent subject of study in its own right. Menkaure’s monument, smaller and comparatively plain by comparison, often served as a secondary stop for survey teams focused on its larger siblings, even though its interior burial chamber and passage system have long been documented in detail.

That research imbalance is part of what makes the new findings notable. Modern geophysical techniques are inexpensive and non-destructive enough that teams can now justify running full-monument surveys across sites that previously received only partial attention, simply because the equipment has become more portable and the interpretation software more capable of filtering noise from genuine subsurface anomalies.

How Egyptian Authorities Typically Handle Findings Like This

Any request to physically investigate a suspected void inside a Giza monument has to pass through Egypt’s Ministry of Tourism and Antiquities, which oversees all excavation and invasive study at protected sites on the plateau. That approval process tends to move deliberately, weighing the scientific value of further investigation against the physical risk that even minimally invasive techniques, such as drilling a narrow bore hole for a fiber-optic camera, pose to a structure that has already stood for roughly 4,500 years. Previous anomaly investigations elsewhere on the Giza plateau have sometimes taken years to move from initial detection to any physical follow-up, a pace that reflects both bureaucratic caution and a broader philosophy among Egyptian antiquities officials that irreplaceable monuments should not be altered without strong justification.

Researchers involved in the Menkaure survey have indicated they plan to pursue that approval process, framing the request around the specific, testable hypothesis tied to the pyramid’s polished eastern stonework rather than a general search for hidden chambers. That kind of targeted justification tends to fare better with regulators than open-ended requests to probe a monument broadly, since it gives officials a concrete, falsifiable question to weigh against the risk of intervention.

Morning Overview produced this article with AI assistance and reviewed it against the cited sources.

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