That&#x27;s actually used in geological imaging. They might use small explosions or shoot the ground with a shotgun or drive over it with series of overloaded trucks. You can&#x27;t destroy the surface of the pyramid with TNT, so it might be tricky.<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Seismic_tomography" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Seismic_tomography</a><p>Other possibilities are ground radar. With big bunch of different problems. Mainly there is anything conductive in the surface layers, ground radar can&#x27;t get past that. Typically it&#x27;s only used to few meters depth, the deeper you go, the less you get data out of it.<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Ground-penetrating_radar" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Ground-penetrating_radar</a><p>And radiographic means. These typically give best image. Dalke explained that some form of these was used elsewhere in this thread. These are possible as you can have receiver at the opposing side.<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Industrial_radiography" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Industrial_radiography</a>