[bleak]

I heard this theory that there were Gods that helped build the pyramids, in preparation for an extinction of some sort. They out all if the common folk (humans) into the pyramids to keep them safe. In the process and afterwards, the Gods were wiped out. Humans lived in the pyramids for generations, hundreds of years. By the time they left, when they saw what they were staying inside, they just assumed that they had built it, and no one was still alive to say what had actually hapoened. These people would become the Egyptians.