A team of international archaeologists from multiple countries have discovered a hidden corridor in the Great Pyramid at Giza in Egypt.
The 30-foot-long vaulted tunnel is located on the north face of the pyramid, which was built 4,500 years ago during the time of King Khufu. The archaeologists believe the corridor was designed to help distribute the weight of the pyramid, which is thought to be made of several million pieces of limestone and measures 450 feet high and 750 feet wide.
The discovery was made as part of Scan Pyramids, a project that uses a technique called cosmic-ray muon radiography to investigate the inside of pyramids without causing destruction. It works by firing radiation through the pyramid, then reading the radiation when it travels to detectors placed around the pyramid.
The corridor was first found in 2017 using the cosmic ray technology, making it the first major inner structure found in the Great Pyramid since the 19th century. Now, the archaeologists are reporting more details and analysis on this corridor in an article published in the journal Nature.
According to Reuters, in order to get the precise analysis, scientists retrieved images by feeding an endoscope through a small joint in the pyramid’s stones.
Other chambers that have been discovered in the pyramid so far, which you can see in the illustration below, include a subterranean chamber (a), a queen’s chamber (b), a grand gallery (c) and a king’s chamber (d). The newly uncovered hidden corridor in the illustration is labeled h.