Step Pyramid Interior

During construction many alternation were made to the pyramid.
1) A mastaba of granite altered twice.
2) A 4-step pyramid.
3) The final 6-step pyramid (124x109x62 m) coated with limestone (later taken away). The grave chamber (red) was made separately of granite und placed at the bottom of the shaft from the original mastaba. It only contained an empty sarcophagus when entered and a gigantic stone plug in the roof locked the whole chamber.
Around it lots of corridors and store room were cut out in the bedrock on different levels and eleven shafts with corridors were made at the eastern side of the mastaba.
To the north (downwards on the map) a mortuary temple was built and this part of the pyramid complex has not been investigated fully jet.