It’s harder than you might expect to get a signal through that much solid rock. The technology to do so is pretty new.
Since these are also millenia-old cultural artifacts of immense historical significance there’s a lot of Egyptian Government red tape and archeological care that must be taken when working on them. You can’t just take a pickaxe to them looking for shafts and tombs, all tests must be carefully monitored and non-destructive.
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