It's also still out there that the Egyptians themselves actually inherited the tech from a yet older human civilization as well. I'm of a belief of the possibilities of major civilizations existing and then being destroyed by nature or artificial self means and practically deleting history as it cycles to the next civilization. Like the Incas who were clearly building on older foundations. Many races have built over preceding populations all over the world. It's kind of how we evolve. On the shoulders of the past.