The pyramids of Giza are mostly solid masses of stone with very little to be found inside. Like many ancient Egyptian pyramids, those of Khafre and Menkaure have passageways at their base that lead to small subterranean burial chambers underneath each pyramid.
How were the pyramids actually built?
The most plausible one is that the Egyptians employed a sloping and encircling embankment of brick, earth, and sand, which was increased in height and length as the pyramid rose; stone blocks were hauled up the ramp by means of sledges, rollers, and levers.
Were pyramids built under ground?
Were the pyramids built from the bottom up?
But this is certain, that the upper part of the pyramid was finished off first, then the next below it, and last of all the base and the lowest part.
Were the pyramids completely buried?
Short answer no, longer answer below: This etching shows the build up of sand when Belzoni worked at penetrating the pyramids in 1818 – this is Khafre's tomb. They've always been visible, unlike the Sphinx which was partially buried by sand from time to time.