I think I remember reading a fictional book about this. Something about the pyramid being a necropolis and there being a machine taking you up to a different ar

I think I remember reading a fictional book about this. Something about the pyramid being a necropolis and there being a machine taking you up to a different area that was supposed to be the "heaven" in the duality. Alien God thing with blue skin... I think it was related to the "Excavation" series.