THEY weigh more than 100 tons, they are solid Aswan granite, and they are precision engineered to tolerances which would be deemed remarkable today.
So how did the ancient Egyptians build and put in place the 24 strange and sinister coffin shaped black boxes discovered buried in a hillside cave system, 12 miles south of The Great Pyramid of Giza?
And more importantly, why?
The skilfulness of the stone cutting, accurate to just a few microns, is so remarkable that some experts have concluded that they were not built for Egytian pharaos but in fact left on earth by and alien race and simply appropriated by the kings.
The stark black boxes do display some hieroglyphics but they are of such poor quality that the scribbles are regarded as graffiti.
The real purpose and function of the boxes remains unclear, but the were clearly of importance, as they were cut with such precision they would remain airtight for many millennia.
They are known as the Serapeum of Saqqara in the now abandoned city of Memphis, Egypt.