Pyramids were built in layers

The Queens chambers two channels, once reached the last surface of the pyramid. Then the next Pharao built the next layer on the pyramid,
that we see today.
Like other large pyramids like Cholula pyramid new pharaos built a new bigger on top on the other.
Cholula pyramid was enlarged four times.
That is why the queen chambers two shafts ends in the pyramid.
Where these shafts end was the last layer before the last layer that we see today.
That is also why radar show that the last layer was built as a spiral up around the pyramid.
Regards
M.Sc, Magnus