Hmmm.
Genesis 41:49 And Joseph gathered corn as the sand of the sea, very much, until he left numbering; for it was without number.
And Joseph gathered corn = 666. Gee I just knew that one would come in handy.
They ascertained that both shafts were similar in terms of dimension and surface, which is lined with mortar and covered in salt crystals.
"They [children of Seth] also were the inventors of that peculiar sort of wisdom which is concerned with the heavenly bodies, and their order. And that their inventions might not be lost before they were sufficiently known, upon Adam's prediction that the world was to be destroyed at one time by the force of fire, and at another time by the violence and quantity of water, they made two pillars, the one of brick, the other of stone: they inscribed their discoveries on them both, that in case the pillar of brick should be destroyed by the flood, the pillar of stone might remain, and exhibit those discoveries to mankind; and also inform them that there was another pillar of brick erected by them. Now this remains in the land of Siriad to this day." ~ Josephus, Antiquities, I, ch. 2, par. 3