Forteana

Claims that researchers discovered previously unknown structures beneath the Pyramid of Khafre — the pyramid situated in the center of the Great Pyramids of Giza — using radar technology circulated online in March 2025.

The purported discovery was that of "five identical structures near the Khafre Pyramid's base, linked by pathways, and eight deep vertical wells descending 648 meters underground."

Users took to social media to express their excitement over the alleged findings, posting on social media platforms like X (archived), Instagram (archived) and TikTok (archived). Some referred to the discovery as "a vast underground city." One YouTube video sharing the claim stood at over 35,000 views as of this writing.

Despite the popularity of the claim, there is no evidence to support it. In addition, no credible news outlets or scientific publications have reported on this rumor.

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The researchers named in the recent claims, Corrado Malanga and Filippo Biondi, did publish a paper and book about their work using Synthetic Aperture Radar (SAR) to explore the Giza pyramid in 2022.

According to NASA, SAR is "a type of active data collection where an instrument sends out a pulse of energy and then records the amount of that energy reflected back after it interacts with Earth."

However, it does not appear that this research has been peer-reviewed or corroborated by credible archaeologists. Additionally, the research alludes to fringe theories about ancient civilizations and otherworldly intentions for the structures, which aligns with Malanga's well-documented interest in UFO and alien abduction research as well as Dunn's "power plant" theory.