Simply, because that would involve disassembling them, potentially causing collapse and destroying more than we would find.
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Because why? The pyramids are not a fun park or escape room, they are a piece of art. How would you feel if we'd tear Mona Lisa apart to check if there's some older painting below the outside layer and the canvas?
Couldn't they have found something like that ages ago?...
How on earth is this just happening in 2023. Ultrasound, xrays, whatever. SOMETHING would have shown this cavity.
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.