A study using essentially your idea was published in Nature recently: https://www.nature.com/news/cosmic-ray-particles-reveal-secr... They found a previously unknown 30-meter void inside the Great Pyramid.
A study using essentially your idea was published in Nature recently: https://www.nature.com/news/cosmic-ray-particles-reveal-secr... They found a previously unknown 30-meter void inside the Great Pyramid.