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ELI5: Why haven’t we fully explored the pyramids yet?
(lemmy.world)
Simplifying Complexity, One Answer at a Time!
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Not sure how old the program was OP watched but they found one void in 2017 using cosmic rays. I'm guessing the pyramids are way too solid for ultrasound or x-ray to work.
https://www.science.org/content/article/cosmic-rays-reveal-unknown-void-great-pyramid-giza
Potentially I suppose. They must be much larger than I anticipate.