Overview
- Researchers detected two likely air‑filled anomalies directly behind a roughly 4 by 6 meter polished granite zone that is otherwise only seen at the known north entrance.
- The larger cavity begins about 1.4 meters below the surface and measures roughly 1.5 meters wide by 1.0 meter high, while the smaller is about 0.9 by 0.7 meters.
- The survey combined electrical resistance tomography, ground‑penetrating radar and ultrasound to map the near‑surface structure without invasive excavation.
- The team proposes the voids could belong to a passage or secondary entrance, yet their full extent remains unknown because the methods lacked deeper penetration, prompting calls for further non‑invasive work and scholarly review.
- The findings were published in NDT&E International in 2025 by Khalid Helal and colleagues from Cairo University and TUM, aligning with recent non‑invasive discoveries at Giza such as the 2023 muon‑scan voids in Khufu’s pyramid.