A pyramid with several interior designs
The Great Pyramid of Khufu is unusual because its interior is more complex than that of most Egyptian pyramids. Its layout looks like the result of changed plans during construction, with chambers at three different levels. Not every point about the reasons is settled, and scholars treat the following descriptions as observations, with explanations for the changes remaining partly interpretation.
The entrance and passages
The original entrance is on the north face, set above ground level. Visitors today usually enter by a forced tunnel nearby, traditionally attributed to the caliph al-Ma’mun in the early ninth century CE. A descending passage leads down through the masonry and into the bedrock, ending in an unfinished subterranean chamber. A branch, the ascending passage, climbs from the descending passage and opens into two destinations: a horizontal passage to the so-called Queen’s Chamber, and the Grand Gallery, which leads to the King’s Chamber.
The Grand Gallery and King’s Chamber
The Grand Gallery is a steeply rising corridor of nearly 50 metres, with a high corbelled roof in which each course of stone steps inward. It is a striking feat of masonry. At its upper end, a small antechamber leads to the King’s Chamber, built of red granite from Aswan and containing an empty, lidless granite sarcophagus. Its roof is made of huge granite beams, and above them are five relieving chambers, designed to spread the load of masonry. These upper spaces were opened in the nineteenth century and contain graffiti left by work crews, including the name of Khufu painted in a cartouche. This is among the strongest pieces of evidence tying the pyramid to its king, and the writing is in the Egyptian hieroglyphic script. The stone sarcophagus design here is plain and heavy, and by the time the chamber was recorded by modern visitors it held no burial.
The Queen’s Chamber and the shafts
The so-called Queen’s Chamber lies at the centre of the pyramid, below the King’s Chamber. The name is a modern convention and not an ancient label. It has a corbelled roof and a niche in the east wall. Narrow shafts rise from both the King’s Chamber and the Queen’s Chamber. The King’s Chamber shafts reach the exterior. Those from the Queen’s Chamber originally did not, and they have been explored with small robots. In 1993 a robot found a limestone slab with two copper fittings at the end of one shaft. A later robot expedition in 2011 got a camera beyond a small hole drilled in this slab and saw a further sealed surface with red marks. The purpose of these features is unknown.
Older books often claim the shafts were “air shafts” or were aimed at particular stars. Both ideas are debated. Some Egyptologists link the shafts to religious beliefs about the king’s soul rising to the sky, in line with Egyptian sky watching, but there is no text that states the intention, and the shafts may have had more than one purpose.
Recent scanning discoveries
Since 2015, a project known as ScanPyramids has used non-invasive techniques. These include thermal imaging and muon detectors, which register cosmic-ray particles that pass through stone. Fewer muons reaching a detector indicates denser material, and more suggest an open space. This is a different approach from the LiDAR survey and aerial mapping used in other sites.
In 2017 the team reported a large void above the Grand Gallery, which became known as the Big Void. It is at least 30 metres long. Its shape and purpose are not known, and it has not been entered. It might be a construction feature, such as a way to relieve weight above the Grand Gallery, or a gap left by building methods, but this is speculation. In 2023 the same project reported a smaller corridor, a few metres long, behind the stones of the north-face entrance, observed using muon data and a thin endoscope camera. It may be a structural feature that helps spread weight over the entrance. Thermal anomalies on the pyramid’s exterior have also been noted, though their cause is not established.
These findings show that the interior of the Great Pyramid is not yet fully mapped. They do not imply hidden treasure or a lost chamber of secrets, and the researchers describe them cautiously. Such results are checked against other methods, and any drilling or entry would require permission from Egyptian authorities.
What the interior tells us
The sequence of subterranean chamber, Queen’s Chamber and King’s Chamber is often explained as a series of design changes, as the builders moved the burial place higher in the structure. Other explanations treat the chambers as parts of a single plan. In either case, the interior shows deliberate engineering to protect a burial and to support the weight above. Burial customs of the Fourth Dynasty, including Egyptian afterlife beliefs, explain the effort. What remains uncertain is the sequence of the plans, how the huge granite beams were lifted, and what the newly found voids contain.