The fact that Salt and Caviglia had explored Giza's catacombs for a distance of several hundred yards before giving up implied that if these presumably natural caves followed the natural contours of the plateau's underlying geology, then it meant that they could easily link up with a whole labyrinthine network of cave tunnels that existed beneath the main pyramids field, before disappearing beneath Gebel Gibli. These in turn would link with underground waterways, one of which carries water to the well Bir es-Samman, another possible entrance to Giza's hidden realm.
Andrew Collins is a science and history writer, as well as the author of over a dozen books including Times bestseller From the Ashes of Angels (1996), Göbekli Tepe: Genesis of the Gods (2014), The Cygnus Key: The Denisovan Legacy, Göbekli Tepe and the Birth of Egypt (2018), and Denisovan Origins: Hybrid Humans, Göbekli Tepe and the Genesis of the Giants of Ancient America (2019), co-authored with Greg L. Little. He lives in the UK. His website is www.andrewcollins.com - 2b1af7f3a8