Structures

By STACY LIBERATORE, US SCIENCE & TECHNOLOGY EDITOR
PUBLISHED: 14:14 EST, 8 December 2025 | UPDATED: 06:59 EST, 9 December 2025

A team of Italian scientists took the world by storm last March when they announced the discovery of a colossal underground complex plunging nearly 3,500 feet beneath Egypt's Giza Plateau and linking chambers the size of city blocks.

Now Filippo Biondi, the radar engineer who developed the imaging method, has gone public with evidence that he said leaves little room for doubt.

In a new interview on Jesse Michels' American Alchemy podcast, Biondi revealed that four independent satellite operators, Umbra, Capella Space, ICEYE and Italy's Cosmo-SkyMed, all returned identical raw tomography data showing the same structures.

'All four satellites gave exactly the same results,' Biondi said. 'That is really amazing. We cannot announce anything without these basic scientific methods.'

Using a technique he pioneered called synthetic aperture radar Doppler tomography, Biondi's team measures microscopic vibrations on the Earth's surface.

Those vibrations carry acoustic 'fingerprints' from objects thousands of feet underground, allowing the software to reconstruct 3D images even though the radar waves themselves never penetrate the soil.

The scans reveal eight massive hollow cylinders dropping straight down from the base of the Khafre pyramid, the middle of the three great pyramids.

Each shaft has a central column wrapped in perfect helical coils and terminates more than 3,500 feet below the plateau in 260 × 260 × 260-foot cubic chambers, larger than most modern sports arenas.

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