The discovery was made under the Scan Pyramids project, a program launched in 2015 that aims to explore and discover ancient Egyptian Pyramids using non-invasive and non-destructive techniques. The group, which includes Cairo University and the French Heritage Innovation Preservation (HIP) Institute currently uses infrared thermography, 3D simulations, and cosmic-ray imaging. Reuters reports that the discovery could provide more information of the Pyramid’s construction and the purpose of a gabled limestone structure located at the front of the corridor. 

It’s theorized that the corridor was made to redistribute the pyramid’s weight around either the main entrance, now used by tourists, or around a potentially undiscovered space. Scientists found the corridor through cosmic-ray muon radiography and then retrieved images of it by feeding a 6mm-thick endoscope from Japan through a small joint in the pyramid’s stones.