GIANT Underground STONE BOXES Near The Pyramids In Egypt

[Scootaloo]

16. Grit, water, wood, granite

First, you chisel your slab of stone to a more or less flat state; It doesn't matter that the copper chisel is softer than the granite, it's the force and angle of the strike that fractures and removes the stone chips.

Second, you take more stone - hand-sized granites, in this case - and you either used them to hammer at the chiselmarks, essentially pulverizing the striations away, or you rub them, grinding it away; the former is faster, but the latter produces a smoother finish (hammering with stones is how the Olmec made those stone spheres in Guatemala)

Next, you take your grit. One thing Egypt has always had is an abundance of grits - from coarse gravels, to rough desert sand, to fine beach sand, to the silt from the Nile - plus lots of grades between. You apply wet grit - mixed with water or oil, depending on whether you need long-lasting viscosity or not - and place a beam of hardwood. With two guys for a big project like that outer lid, you work this beam back and forth, adding sand-paste as needed. Every now and then you wash the project off and use a finer grade of grit.The final grade would be river silt or even pulverized stone from the work site, applied with water or oil, though this time by hand.

Essentially, the same as using sandpaper, or a rock tumbler with elbow grease instead of a rotor.

The corners were probably created in much the same way, though obviously with different tools - finer chisels, lighter hammers, etc.