The ScanPyramids project continues to break new ground on the Great Pyramid at Giza whilst barely laying a finger on it. Their latest find shows that the 4,500-year-old monument has even more mysterious hidden cavities and corridors than their previous work showed.

Their first new discovery is a cavity about 105 meters (345 feet) up from the ground on the northeastern corner of the pyramid. This is followed by another “void” discovered on the north face of the structure, AFP reports.

The project, led by the Egyptian Ministry of Antiquities Authority, uses infrared thermography, “cosmic ray” muon detectors, aerial drone photography, and laser scanning to "look inside" the pyramids in a totally non-invasive way. The project is coming to the final weeks of its year-long mission, which started last October.

The bulk of their work has been conducted on the Great Pyramid, the largest and oldest of the three pyramids at the Giza site, which acts a monument and tomb to Pharoah Khufu. They have also conducted work on its neighbor Khafre in Giza, as well as the Bent pyramid and Red pyramids in the Dahshur necropolis.

The exact size and shape of these new rooms are not yet known by the engineers, however, they’re conducting further scans to get a clearer view. This will also hopefully shed some light onto the function or purpose of the cavities.

Following the controversial work of archaeologist Dr Nicholas Reeves, the prospect of hidden cavities is always set to get the imaginations of Egyptologists going. In 2015, Reeves suggested the long-lost tomb of Queen Nefertiti could be hidden behind the burial chamber of King Tutankhamun.

So, could this discovery be a secret corridor or even a hidden tomb?

It sounds like a plot fit for an Indiana Jones movie, but others are not being so romantic with their estimations, instead believing the cavities are simply just part of the pyramid's structure.

"These people are scientists and do not have an archaeological background," Zahi Hawass, former Egyptian Minister of State for Antiquities Affairs and Director of the Giza Pyramids Excavation, told Seeker. "The core of the pyramid was built using long stones and small stones. If you know that, you'll find anomalies everywhere."

"I think there are no secret rooms and these anomalies have to do with the way the pyramid was built," he added.