In 2017, scientists pointed cosmic rays at the Great Pyramid of Giza. They found something that shouldn't exist. A void. 100 feet long, roughly the size of a passenger plane. Sitting directly above the Grand Gallery, one of the most explored passages in the pyramid. But this chamber has no doors. No tunnels. No way in. The Egyptians built it 4,500 years ago. Then they sealed it. And they never told anyone what was inside. We've explored this pyramid for centuries. Archaeologists, treasure hunter