More than 4,500 years after its construction, the Great Pyramid of Giza still baffles scientists. Built during the reign of Khufu, the monument consists of approximately 2.3 million stone blocks, some weighing several tons, all assembled with astonishing precision. For decades, experts have debated how ancient workers accomplished this without cranes, steel or modern tools. Now, a new study led by Vicente Luis Rosell Roig is published in the journal natureoffers a compelling explanation that combines engineering logic with archaeological evidence, pointing to a hidden construction method for the pyramid itself.
How the ancient Egyptians moved boulders to build the Great Pyramid
At the heart of the research is a concept called an Integrated Edge Ramp (IER) system. Research shows that instead of building a massive ramp outside the pyramid, which would require a lot of material and space, the ramp was built into the pyramid structure itself.Workers may have intentionally left gaps in the outer layers of the pyramid. The gaps create a spiral path that allows workers to move the stone upward during construction. Once a section is completed, the gaps are filled, leaving no visible traces of the ramp in the final structure.As Roeg explains in the study, the goal was to test whether such a system could “achieve record construction speeds within the material and technological constraints of the Old Kingdom.” In short, the model asks whether the ancient Egyptians could have built the pyramids in this way using the tools they actually had.The scale of the challenge is staggering. Each block must be mined, transported, lifted and precisely placed. The new model shows that workers used sleds, manpower and carefully coordinated logistics to move the stone along an internal ramp system.Rather than lifting the block vertically in one go (which would be nearly impossible), the spiral channel allows for a gradual rise. This reduces strain, distributes weight more efficiently, and keeps the structure stable throughout construction.According to simulations, during peak construction periods, blocks could be positioned every four to six minutes. When extended to the entire project, this speed makes completion of the pyramid within decades more credible than previously thought.
The 3D model shows a hidden spiral ramp used to move stones up the pyramid.
Why early theories struggled
For many years, the dominant explanation involved large external ramps. However, these theories encountered serious problems. If a straight slope were long enough to reach the top of the pyramid, its scale would be enormous and would likely require more material than the pyramid itself.Other proposals suggest the use of internal ramps, but they often fail to explain how workers can manage sharp turns or reach greater heights efficiently.Roeg’s model stands out because it addresses multiple constraints simultaneously. It takes into account limited space, manageable material use, structural stability and realistic construction speeds. It is also consistent with known ancient Egyptian tools and technology.Archaeologists have long emphasized the ingenuity of ancient builders. As Egyptologist Mark Lehner noted in previous research, “The pyramids were built not by slaves or mysterious figures, but by skilled workers using clever organization and simple tools.”
Clues hidden within the pyramid itself
One of the most interesting aspects of the theory is how it explains physical features that have puzzled researchers for years. Certain gaps, irregularities, and wear patterns within the pyramid may not be defects at all, but remnants of the construction process.Research suggests that areas showing signs of heavy use may have been pathways for moving materials, while inconsistencies in stone placement may reflect portions that were filled in after later use as ramps.These details indirectly support the idea that the pyramid’s construction methods were intentionally hidden as part of its final design.
Could it really be built that fast?
The timeline has been a point of contention. Historical estimates suggest the pyramid was completed in approximately 20 to 30 years. Critics often question whether such a massive project can be completed so quickly.However, the new model supports this time frame. Research shows that by combining continuous ramp access with efficient labor organization, construction speeds can match historical records.When including quarrying, transportation and labor logistics, the schedule remains within acceptable limits, reinforcing the theory’s credibility.
Scientists still have no consensus
Although the integrated edge-slope theory has its merits, it is not universally accepted. Archeology rarely provides clear answers, and much of the evidence remains indirect.Some researchers note that intact internal ramps have not yet been directly observed. Others believe that multiple methods may have been used at different stages of construction.As with many ancient mysteries, the truth may lie in a combination of technologies rather than a single solution.
A human achievement, not a mystery
This research conclusively proves that the builders of the Great Pyramid of Giza did not rely on lost technology or supernatural help. Instead, they used ingenuity, planning, and a deep understanding of materials and labor.The idea of building the ramp into the pyramid itself reframed the entire construction process. It shows that seemingly perfect, seamless monuments are actually the result of carefully hidden systems that make the impossible possible.Even today, the pyramids serve as a reminder that ancient engineering was far more complex than we usually imagine.
