Hidden tunnel revealed in Great Pyramid of Giza
STORY: The find was made under the Scan Pyramids project that since 2015 has been using modern technology including scans and endoscopes to peer inside the pyramid, the last of the Seven Wonders of the Ancient World still standing.
The unfinished corridor was likely built to relieve the weight of the pyramid on either the main entrance.
The Great Pyramid was built as a monumental tomb around 2560 BC, during the reign of the Pharaoh Khufu, or Cheops.
It stands at a height of 146 meters (479 feet), the tallest structure built by humankind until the Eiffel Tower in Paris in 1889.