The 2024 Tohoku University GPR and ERT survey detected an L‑shaped feature roughly 6.5 ft (≈2.0 m) below the surface and about 33 ft (≈10 m) long in Giza’s Western Cemetery, with a deeper resistive anomaly at 16–33 ft (≈5–10 m). The shallow shape appears unlikely to be natural and "may" mark an entrance, but remote sensing cannot identify material or purpose. The peer‑reviewed study (Archaeological Prospection) recommends targeted excavation; the anomaly remains unresolved and is distinct from rejected claims about Khafre’s pyramid.
Ground‑Penetrating Radar Finds L‑Shaped Anomaly Near Great Pyramid — Possible Entrance, Needs Excavation
Experts Find 'Anomaly' Near the Great PyramidsNick Brundle Photography - Getty Images
Ground‑penetrating radar (GPR) and related geophysical methods have transformed archaeology by revealing buried features without excavation. In 2024 a team led by Motoyuki Sato of Tohoku University used GPR together with electrical resistivity tomography (ERT) to survey a relatively blank area of the Western Cemetery west of the Great Pyramid of Giza.
What the Survey Found
The combined survey identified a shallow L‑shaped feature located about 6.5 feet (≈2.0 m) below the surface and extending roughly 33 feet (≈10 m). Beneath that, between about 16 and 33 feet (≈5–10 m), the team detected a deeper, highly resistive anomaly.
How the Methods Work
GPR transmits radar pulses into the ground and records reflections from subsurface interfaces; ERT measures how subsurface materials conduct electrical current. Used together, the methods map contrasts in shape and composition beneath the sand without disturbing the site.
Possible Interpretations
The study, published in Archaeological Prospection, notes two main explanations for the deeper resistive signature: a layer of sand and gravel that resists current, or a volume with sparse material or air voids (which also appears resistive). The L‑shaped shallow feature appears too geometrically sharp to be a natural formation, leading the team to suggest it may have served as an entrance to the deeper anomaly—but remote sensing alone cannot confirm material, function, or date.
“From the survey results, we cannot determine the material causing the anomaly, but it may be a large subsurface archaeological structure,” the authors write.
Context and Next Steps
The Western Cemetery is dense with mastabas and other high‑status burials; this particular patch drew little attention because it lacks clear surface architecture. The authors call for targeted excavation to establish the anomaly’s nature and significance. Until such work is carried out publicly, the finding should be treated as an intriguing but unresolved discovery.
This GPR/ERT result is a peer‑reviewed, methodologically grounded study and should not be conflated with later, widely circulated claims about enormous hidden voids under the Pyramid of Khafre—claims that Egyptian archaeologist Zahi Hawass publicly rejected in 2025.
Why It Matters
The survey highlights the value of integrated geophysical approaches at heavily studied sites: they can reveal new features in areas previously thought to be well understood and help prioritize future excavation. Confirming what lies beneath the L‑shaped anomaly will require careful, targeted fieldwork and conservation‑minded excavation.
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