00:00In 2017, a team of physicists pointed a particular detector at the Great Pyramid of Giza and found
00:06something that had not been seen since the structure was built over 4,500 years ago.
00:11An enormous hidden space at least 30 meters long, sitting directly above one of the pyramid's
00:16most famous chambers. No one has ever been inside it. No one even knows what it is for.
00:21The Great Pyramid has been studied, mapped, and explored for over two centuries. Every
00:25known chamber, shaft, and gallery has been documented since the 1800s. So how did scientists
00:30in 2017 find something completely new, without digging, drilling, or damaging a single stone?
00:35By the end of this video, you will know exactly how this hidden world was found,
00:39what scientists have learned about its size and shape, and why years later we still don't know
00:44what is inside it. This discovery was not made using ground-penetrating radar, thermal cameras,
00:49or anything built specifically for archaeology. It was made using particles that fall from outer space,
00:54particles that pass through your body, by the trillions every second, without you ever noticing.
00:59We will get to exactly how researchers turned cosmic rays into an X-ray machine for a 4,500-year
01:05-old
01:05monument. This technique is called mound radiography, and here is the basic idea. When cosmic rays from
01:10deep space slam into Earth's atmosphere, they create a shower of particles called mounds,
01:15heavier cosines of electrons. Mounds rain down on everything, including the Great Pyramid,
01:20and they can pass straight through solid stone. But here is the key. Dense material
01:23observes slightly more mounds than empty space does. So if you place detector inside the pyramid,
01:28mound chambers can count how many mounds arrive from different directions. You can map out where
01:33the stone is thinner than expected. Death-in stone is not necessarily a mistake. It is a signature of
01:38a hidden void. Starting in 2015, a project called ScanParamid placed several different types of mound
01:43detectors inside the Great Pyramid, in the Queen's chamber specifically, using nuclear immersion film,
01:48electronic simulator detectors, and gas detectors, three completely independent detection technologies.
01:53If a world showed up in all three separately, there's rule of equipment error or coincidence.
01:58In 2017, all three methods agreed on the same result. Published in the journal Nature,
02:02there was a massive void sitting directly above the Grand Gallery, the famous low passage that leads
02:07up toward the King's chamber. This new space now called ScanParamid's Big World, has a cross-section
02:12similar in size to the Grand Gallery itself, and set is at least 30 meters long, making it one of
02:17the
02:17largest internal structures ever found in the pyramid, and the first major discovery of its kind
02:21since the 19th century. So what is actually inside it? The void has never been physically entered. A small
02:27robotic camera has been used to peek through any existing gaps nearby, but it has not reached the
02:31void itself. Researchers have proposed a few possibilities. There could be a construction gap
02:36left behind to relieve the weight of the stone above the Grand Gallery. It could be a separate
02:40seen undiscovered internal chamber, or it could serve some purpose connected to the pyramid's
02:44construction process that we simply don't understand yet. Letters can in 2009 confirm
02:49the world's existence again from new angles, but they did not reveal its purpose or find a way inside.
02:54What is hidden inside the unexplored void of the Great Pyramid? Based on everything we currently know,
02:59the honest answer is that we have confirmed the space exists with extremely high confidence,
03:03using three separate detection methods, but its actual contents and purpose remain completely unknown.
03:08No treasure has been suggested by any of the data. For now, this genuinely is one of the last
03:13true unserved mystery of the Great Pyramid, hitting in plain sight for over 4,000 years.
03:19So
03:19Labs
03:19So
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