Egyptologist Mark Lehner, featured in the Nature of Things documentary, Secrets of the Pyramids, explores the Great pyramid's "Subterranean Chamber" located more than 100 metres underground.  

This mystery chamber is the only part of the pyramid that is unfinished. Experts speculate that is was still being carved out when the pharaoh Khufu died, so workers put down their tools and left. A treasure trove for archeologists, it gives information about the extreme conditions the Egyptians endured to build the pyramid. It wasn't a job for the claustrophobic. Workers had to crawl along a football field-sized passage on their hands and knees just to reach this chamber. 

MORE:
Lost Secrets of the Pyramid
Fly Over Giza’s Great Pyramid With A Drone
An Ancient Papyrus Reveals How The Great Pyramid of Giza Was Built

This chamber is off-limits to the public and only has been photographed a few times.

 

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