Egyptian archaeologist Zahi Hawass, Egypt's former head of antiquities, speaks in front of the Great pyramid, built by Cheops, known locally as Khufu in Giza, Egypt, Thursday, June 2, 2016. A scientific team scanning the Great Pyramid aimed at discovering the famed pharaonic monument's secrets including possible hidden burial chambers. (AP Photo/Amr Nabil)

What mysteries might still be hidden under Egypt's pyramids? A team accompanied by Egypt's former antiquities minister and famed archaeologist Zahi Hawass are testing a new scanner on the Great Pyramid of Giza on Thursday, hoping that modern technology could help unlock ancient secrets buried deep beneath the stone.

The scanner, which uses subatomic particles known as muons to examine the 4,500 year-old burial structure, was first set up at the site last year and will complete its data collection this month.

"It's running right now, and if it manages to detect one of the three chambers we already know exist inside, then we will continue the scans," Hawass said. He has been appointed by the Antiquities Ministry to head the team that will review the scan results.

Late last year, thermal scanning identified a major anomaly in the pyramid—three adjacent stones at its base which registered higher temperatures than others.

Hawass has in the past downplayed the usefulness of scans on ancient sites, saying that they have never found anything important. He has clashed publicly with British Egyptologist Nicolas Reeves, whose theory that secret burial chambers could be hidden behind the walls of King Tutankhamun's tomb was both prompted and reinforced by scanning.

For more than a decade Hawass was a celebrity starring in TV documentaries, eventually ruling the Antiquities Ministry like a pharaoh. He was dismissed from the post after Egypt's 2011 uprising that toppled longtime autocrat Hosni Mubarak and faced corruption charges, of which he was later cleared.

Dutch tourists visit the inside of the Great Pyramid, built by Cheops, known locally as Khufu in Giza, Egypt, Thursday, June 2, 2016. A scientific team scanning the Great Pyramid aimed at discovering the famed pharaonic monument's secrets including possible hidden burial chambers. (AP Photo/Amr Nabil)

But back in the field following his new appointment, Hawass seemed more reluctant to criticize scanning technologies. He said they could be useful if directed by the right hands—such as his own.

"You need Egyptologists to oversee all this, otherwise mistakes can be made," he said. "I hope these scans will help us obtain accurate information," he said, adding that he believed another burial chamber remains undiscovered inside.

Debate over possible new discoveries in Egyptology echo far outside the country, most recently over a contested theory that King Tutankhamun's tomb contains additional antechambers.

Last month, researchers led by Daniela Comelli of the Polytechnic University of Milan published a paper on a rare iron dagger found inside the boy king's sarcophagus. Using a new form of portable x-ray fluorescence spectrometry, the team said that the dagger, dating to the Bronze Age, was most likely made using iron from a meteorite.

Tourists pose for pictures at the entrance of the Great Pyramid, built by Cheops, known locally as Khufu in Giza, Egypt, Thursday, June 2, 2016. A scientific team scanning the Great Pyramid aimed at discovering the famed pharaonic monument's secrets including possible hidden burial chambers. (AP Photo/Amr Nabil)

Egyptian archaeologist Zahi Hawass, Egypt's former head of antiquities, speaks in front of the Great pyramid, built by Cheops, known locally as Khufu in Giza, Egypt, Thursday, June 2, 2016. A scientific team scanning the Great Pyramid aimed at discovering the famed pharaonic monument's secrets including possible hidden burial chambers. (AP Photo/Amr Nabil)

French expert Sebastien Procureur, right, talks to Egyptian Antiquities Minister, Khaled El-Anani, fourth right, and Zahi Hawass, Egypt's former head of antiquities, second right, in front of a muon detector machine at a tent in front of the Great pyramid, built by Cheops, known locally as Khufu in Giza, Egypt, Thursday, June 2, 2016. A scientific team scanning the Great Pyramid aimed at discovering the famed pharaonic monument's secrets including possible hidden burial chambers. (AP Photo/Amr Nabil)

Egyptian Antiquities Minister, Khaled El-Anani, left, and Zahi Hawass, Egypt's former head of antiquities, second left, listen to French expert Sebastien Procureur in front of a muon detector machine at a tent in front of the Great pyramid, built by Cheops, known locally as Khufu in Giza, Egypt, Thursday, June 2, 2016. A scientific team scanning the Great Pyramid aimed at discovering the famed pharaonic monument's secrets including possible hidden burial chambers. (AP Photo/Amr Nabil)

Egyptian archaeologist Zahi Hawass, Egypt's former head of antiquities, speaks in front of the Great Pyramid, built by Cheops, known locally as Khufu in Giza, Egypt, Thursday, June 2, 2016. A scientific team scanning the Great Pyramid aimed at discovering the famed pharaonic monument's secrets including possible hidden burial chambers. (AP Photo/Amr Nabil)

A Japanese tourist visits the inside of the Great Pyramid, built by Cheops, known locally as Khufu in Giza, Egypt, Thursday, June 2, 2016. A scientific team scanning the Great Pyramid aimed at discovering the famed pharaonic monument's secrets including possible hidden burial chambers. (AP Photo/Amr Nabil)

Egyptian Antiquities Minister, Khaled El-Anani, left, and Zahi Hawass, Egypt's former head of antiquities, second left, listen to French expert Sebastien Procureur in front of a muon detector machine in front of the Great Pyramid, built by Cheops, known locally as Khufu in Giza, Egypt, Thursday, June 2, 2016. A scientific team scanning the Great Pyramid aimed at discovering the famed pharaonic monument's secrets including possible hidden burial chambers. (AP Photo/Amr Nabil)

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