A hydraulic lift inside Djoser's Step Pyramid
A 2024 study proposed that a shaft-and-plug system at Saqqara used controlled water flow to raise a platform carrying building stone — the first peer-reviewed hydraulic-lift proposal of its kind for pyramid-era construction, built from a computer model, satellite imagery and the site's surviving internal shafts.12
Acoustic engineers have independently measured the King's Chamber's natural resonance. Tom Danley, an engineer whose work includes NASA projects, identified an eigenmode near 121 Hz — close to a low male voice — and more recent LiDAR and impulse-response studies have confirmed the chamber's unusual acoustic behavior with modern measurement methods.34
The chamber's granite is high in quartz, which is piezoelectric: it generates a measurable electrical charge under vibration or pressure. A 1997 single-researcher cymatics study of the sarcophagus is documented but has never been independently replicated, and is treated here as preliminary.5