Mysterious empty chamber found in the Great Pyramid of Giza

Imaging technology has revealed a mysterious 30-metre long void inside The Great Pyramid of Giza in Egypt.

The Great Pyramid, or Khufu’s Pyramid, was built during the reign of Pharaoh Khufu (Cheops), who reigned from 2509 to 2483 BC. It is the largest of the three great pyramids at the Giza pyramid complex in Egypt. (ScanPyramids mission)
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Scientists discovered a mysterious "void" inside the Great Pyramid of Giza, one of the oldest man-made structures on Earth. 

It covers more than five hectares, stands 150 metres in height, and is built from nearly 2.5 million stone blocks.

In 2015, a team of international scientists — led by Medhi Tayoubi from an organization called ScanPyramids —  used imaging techniques borrowed from a field of particle physics called muon tomography, to look deep inside the largest pyramids in Egypt. This included the Great Pyramid of Giza. 

Just last year, they discovered a mysterious 30-metre long "void" inside the pyramid. There are various theories about the purpose of the void, including an earthquake prevention chamber, but for now, the exact function requires further investigation.