Egyptian officials revealed the discovery of a mysterious, 30-foot-long corridor sealed off inside one of the Pyramids of Giza on Thursday.

Egyptian Minister of Tourism and Antiquities Ahmed Issa described the discovery in a Thursday press event, saying the chamber is thought to be some 4,500 years old. The corridor, which lies above the main entrance to the Pyramid of Khufu, is nearly 30 feet long and roughly 6 feet wide.

The area went undetected by archeologists for hundreds of years and was only discovered now thanks to modern scanning equipment. Issa credited the international Scan Pyramids Project (SPP) for making the find.

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