Chambers hidden in Great Pyramid of Giza? Not so fast, say scientists.

A team of scientists have cast doubt on earlier claims that the Great Pyramid of Giza may contain unknown cavities.

Simulation by K. Morishima (Nagoya University) and Benoit Marini for ScanPyramids, results by K. Morishima (Nagoya University) for ScanPyramids
Muography graphs compared

A group of scientists has just claimed to have discovered two unknown voids or cavities within the Great Pyramid of Giza, the largest pyramid ever constructed in Egypt.

Such cavities can be signs of hidden burials or rooms and as such, media outlets across the world immediately ran headlines touting this "discovery." One outlet even went so far as to proclaim that "secret rooms" had been found in the Great Pyramid.

However, Live Science has learned that the results are more ambiguous. Scientists who are charged with overseeing the team's work, including Zahi Hawass, Egypt's antiquities minister, said they are not convinced that sizable voids or cavities have been discovered. [See Images of the Great Pyramid and the 'Voids']

Built by the Pharaoh Khufu over 4,500 years ago, the Great Pyramid is the largest such structure in Egypt, and one of three pyramids built at Giza. It rose 481 feet (146 meters) tall when it was first built, although the loss of stone due to weathering and quarrying of the pyramid means that the structure rises only about 455 feet (138 m) today. Ancient writers called the pyramid a "wonder of the world." It was the tallest building in the world until the Lincoln Cathedral was completed in England in the 14th century.

Unknown voids?

On Saturday (Oct. 15), the Scan Pyramids Project issued a press release saying that two previously unknown voids or cavities had been discovered in the Great Pyramid of Giza. The project consists of a group of scientists from different universities, institutes and companies who are scanning Egypt's pyramids using various technologies.

According to the statement, one void is located on the north face of the pyramid behind an area where four building blocks with "chevron" designs (an inverted v-shaped pattern) are visible. The chevrons would not have been visible in ancient times, as the designs would have been covered with casing stones that were stripped off the pyramid centuries ago. In addition, another void was discovered on the northeast corner of the pyramid about 344 feet (105 m) above the ground.

To find the voids, scientists used muography, a technique that measures the density of muons, or subatomic particles that are the primary component of cosmic rays raining down on Earth. [In Photos: Inside Egypt's Great Pyramids]

"Muon particles permanently reach the Earth with a speed close to the speed of light and a flux around 10,000 per m² per minute. They originate from the interactions of cosmic rays created in the universe with the atoms of the upper atmosphere," said the Scan Pyramids project team in its press release. The researchers added that these particles can "go through hundreds of meters of stone before being absorbed."

Muons can easily cross areas where there are voids or cavities, but the particles are sometimes absorbed or deflected when they hit denser material, the team said. By measuring changes in muon particles as they go deeper into the pyramid the team can search for hidden areas. "The challenge of such measurements consists in building extremely precise detectors and in accumulating enough data — over several days or months — to increase the contrast," the team said in the statement.

Caution urged

However, a team of scientists appointed by the Egyptian Ministry of Antiquities to oversee the work of the Scan Pyramids Project team said it is not convinced that sizable voids or cavities have been discovered. This oversight team is led by former antiquities minister Zahi Hawass and includes several Egyptologists with decades of experience. Mark Lehner, who has been conducting work at Giza for about 30 years, is one of the team members.

That group issued its own press release, through the Egyptian Ministry of Antiquities, saying that more work needs to be done. The researchers recommended extending the Scan Pyramids project by another year so that more data can be gathered. They used the term "anomalies" in the press release rather than calling the findings "voids" or "cavities."

Hawass told Live Science that the results obtained by the Scan Pyramid team may be the result of different-size stones used in the Great Pyramid and may not indicate the presence of sizable voids.

"The core [of the pyramid] has big and small stones, and this can show hollows everywhere," he said. The oversight team "asked for more work to know the size and the function" of the anomalies, Hawass said.

Hard lessons learned

Egypt’s antiquities ministry decided to have a group of experienced Egyptologists oversee scanning work after a debacle that occurred at Tutankhamun's tomb.  In an incident that started last year, an Egyptologist named Nicholas Reeves claimed to have found evidence that the tomb of Queen Nefertiti was hidden behind a secret doorway inKing Tut's tomb.

An initial scan suggested that such a tomb may exist, creating a media stir, though provoking skeptical reactions from scientists not involved with Reeves' work. More-detailed scans carried out earlier this year revealed that there was no such Nefertiti tomb.

Before the negative results from the second series of scans came back, officials in the Egyptian antiquities ministry, as well as the tourism ministry, had publicly stated that they believed a hidden chamber, possibly containing Nefertiti's tomb, likely existed. After the negative results, and critical views of the first scan from outside scientists, the antiquities ministry had to backpedal from that position.

Original article on Live Science.

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