Electrical resistivity tomography (ERT)

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2024 BI - Archaeologists found a secret chamber at the base of the Great Pyramid of Giza, and they have no idea what it is
Combining GPR, ERT, and satellite data, the researchers discovered an L-shaped structure measuring roughly 32 by 50 feet buried 1.6 feet to 6.5 feet under the sand. They also found evidence of a 1,000-square-foot structure about 11.5 feet to 33 feet below ground, deeper than the L-shaped anomaly. At some point, the shallower L-shaped structure was filled with sand, which could be a clue to its purpose. It may have served as a kind of passageway to a lower tomb, according to the researchers. Ancient Egyptians often filled up such shafts to keep out the living.