After a long seven-year investigation, a group of scientists has discovered one of the best-kept mysteries of the Great Pyramids of Egypt.

The meticulous work resulted in the discovery of a passage nine meters long and more than two meters long, hidden inside the pyramids and to which no one had access before.

“It is a triangular corridor with a triangular roof and is located in the northern part of the pyramid of King Khufu,” explained the Egyptian Minister of Tourism and Antiquities, Ahmed Issa.

The discovery was part of the ScanPyramids project, launched in 2015 and which brings together professionals from leading universities in France, Germany, Canada and Japan, as well as Egyptian specialists.

Project members use advanced technology, such as 3D reconstruction, to visualize hidden parts of the pyramid’s interior without having to excavate it.

It was ScanPyramids who in 2017 discovered a cavity the size of an airplane in the first large structure found inside the Great Pyramid since the 19th century.

The Great Pyramid of Giza, 146 meters high, was built about 4,500 years ago and is the only surviving structure of the ancient Seven Wonders of the World.

It has three well-known chambers and, like other Egyptian pyramids, was conceived as a pharaoh’s tomb.