The Great Pyramid of Giza may hold secret rooms and tombs yet to be discovered.

It’s pretty well-known, being the largest pyramid ever constructed and one of the Seven Wonders of the Ancient World (and the only Wonder still standing) — and it’s been explored — yet recent thermal scans reveal there may be even more to find within the massive antiquity.

An exploratory team called “Operation Scan Pyramids” is using thermal imaging to re-examine the pyramid, also known as the Pyramid of Khufu, which is over 4500 years in age. The scan team, consisting of researchers from the Université Laval of Quebec, Nagoya University of Japan and the Faculty of Engineering of Cairo University, started the imaging work on October 25 and has since found open zones underneath Khufu’s surface.

The examination is scheduled to continue until the end of 2016, and will also utilize drones, lasers, and 3D scans to complete their efforts. Egyptian Antiquities Minister Mamdouh el-Damaty, recently in the news to challenge Dr. Ben Carson’s beliefs concerning the building of the pyramid, has told the press all Egyptologists are invited to join the research and to work on what could be behind — or inside — the detected irregularities.

Photos via paweesit / Flickr Creative Commons