The sun set, but the world did not fall into darkness.

Around the campfire, Bi Fang cut the sticks, peeling off the wood chips from the surface in layers and pouring them into a cylindrical bark container.

Treading the layer of wood chips, Bi Fang picked and chose several pieces of intact charcoal from the campfire, waited for it to cool and crushed, and poured it into it.

After multiple layers of production, a simple disinfectant mask is made.

The fat from the ostrich meat was boiled into fat, and a piece of hemp rope was tied firmly to a half-cut stick, which was then soaked until the rope had absorbed enough oil, and then inserted into the campfire.

The fiery serpent wound upward, and in a few moments, a torch head was made, and the flames illuminated the surroundings.

The campfire bushes in the same place were watered and extinguished, and Bi Fang came to the shallow entrance of the dark cave.

The firelight illuminates the surroundings of the cave entrance, but it illuminates itself even darker, like a black hole that chooses people to devour, which is inevitably a little scary.

Bi Fang, who was wearing a gas mask, did not rush in, he first placed the torch in front of the entrance of the cave and waited for about a quarter of an hour, during which time he went deeper and deeper until the entire torch was inserted into the cave.

"If it can burn, it means that there is oxygen in it, and there is no violent combustion, which means that there is no combustible gas in it, and it is safe to go in with a torch."

Bi Fang explained briefly.

[Another small detail]

[Fine, really too fine]

[I suspect your scolding, and there is ample evidence (dog head)]

Prepared enough, Bi Fang looked at the cave illuminated by the torches, leaned down, and drilled into it little by little.

The cave itself is not large, and the diameter of the exposed surface is less than half a meter, so it is difficult to enter without lying down.

The orange glow illuminated the passageway, and every inch of the space was covered with heavy gravel, the remnants of which had poured in.

[A little scared]

[After watching too many horror movies, I always feel that something will jump out of front of me]

[At this time, if a rattlesnake or something comes out, it is the most fun]

[Fang Shen: I thank you]

In the deep cave, Bi Fang felt the inclination angle of the road, and made a mark every three meters.

"The angle of inclination is about 30 degrees, and we can tell how many meters we have advanced by making a mark, and then calculate our depth."

"Now, we've probably sunk five meters, which means that the ruins are much larger than we thought, and most likely not some undiscovered pyramid."

Bi Fang lowered his voice, it was quite stuffy, and he was wearing a gas mask, and his breathing was not smooth, which made him a little panting.

The area around the corridor also began to change, no longer completely gravel, but mixed with many flints, and even whole huge stones.

And the size of the passage is also changing, Bi Fang can already go from exploring on his stomach to squatting, but squatting is too laborious, so he still chooses to crawl.

[Why can't it be a pyramid?]

[This drone has a really good signal]

【High Quality Tango NB】

"Because the shape of all pyramids is fixed, the square side length at the bottom of the pyramid is multiplied by two, and when divided by the height of the pyramid, it is about equal to 3.14, that is, π, which is an equal proportional relationship."

"Judging from the size and depth of the area we have found so far, if it is really a pyramid, then the height of this ruin is at least more than ten meters, but the total height of the drop from the passage is less than five meters."

"This means that the 'pyramid' has been cut by more than half, which is very, very small, and we can't imagine what it had gone through before it was destroyed like this."

The pyramids were very sacred in the eyes of the Egyptians, not only a symbol of royal power, but also linked to religion and theocracy.

Even in the 14th century, as Bi Fang said earlier, Bahri Sultan Badr al-Din Hassan demolished the top limestone of the pyramid in order to build a temple, and did not think to move the entire pyramid.

After thousands of years, the pyramid has been eroded by the wind and sand, this erosion is all-round, it is impossible to completely erode more than half of it, but it is left a complete base, and the wind and sand have not been so bad.

Climb along the passage until you descend about six meters, and the slope of the road in front of you increases sharply, but the length of a few meters changes from a small slope of 30 degrees to a super slope of more than 60 degrees.

The slope was more than sixty, and without the stairs, it was impossible for a person to stand at all, and Bi Fang held on to the wall and began to accelerate his slide.

The depth of the descent this time was beyond everyone's expectations, the slope became steeper and steeper, and finally it became almost a ninety-degree vertical drop, if it wasn't for the passage narrow enough to support him with his legs, Bi Fang almost fell.

"Whoa!"

A dull sound echoed through the ruins, and a large amount of fine sand fell with a figure, dripping and jumping.

In the darkness, Bi Fang, who was holding a torch, fell to the ground, and a large amount of dust was raised, blinding his vision for a while.

【Coming, coming】

【High energy ahead】

[Finally came in, this is too narrow, if it is not slippery enough, it is definitely uncomfortable to go in.] 】

【King of Talk】

[It's so dark]

"Finally in."

Bi Fang, wearing a gas mask, slowly stood up from the ground, not choking on the smoke, patted the sand on his shoulder, then took off his shoes and poured out all the sand.

"It really scared me just now, I didn't expect the ruins to be so deep."

Bi Fang raised the torch above his head, and he could still see the pitch-black corridor, and the brief fall made him go deeper than twenty meters underground.

"The Sahara Desert is mainly composed of rocky hamada and sandy land, many of which are more than 180 meters high, with an average height of about 150 meters and even more than 300 meters at the highest.

Carry a torch and walk among the deep ruins.

More than twenty meters underground, there is no light source here, except for the torch in his hand, it is pitch black all around, enough to make any normal person fall into claustrophobia.

[Hastily, this environment, I can't do it]

[Every time I see this kind of torch in the dark, I would rather not have this torch, it has become the only light in the darkness, it is extremely eye-catching, and I feel even more terrifying]

[Plus one, it's like a moth to a fire, and the creatures in the shadows like the light the most (dog head)]

"Tick."

Water droplets fall, magnified countless times in the silence.

Bi Fang followed the sound and walked forward, touching the wall beside him, feeling the wetness of his fingertips.

There is a strong smell of water in this ruin.

Rubbing the damp grit on his fingertips, Bi Fang explained.

"It's very difficult to get water in the Sahara, and if you don't find the right location, you won't get water even if you dig tens of meters."

"But we're pretty close to the Nile at this point."

"Geologists used to study wind-blown sediments, deposits from flowing water, and then, with the help of aircraft radar, saw images of bedrock near the Nile."

"Using a combination of data from the Space Shuttle topographic survey and ground samples, geographers estimated that the Nile River once flooded Egypt's Kiseba Depression, where it formed a giant lake of 42,000 square kilometers that later became a buried paleochannel."

"These paleochannels are periodically activated as a river system during the warming cycle, and recent algorithmic analysis shows that it ended 6,500 years ago and is still back underground."

"The research team at the time also investigated further and estimated that the river stretched more than 520 kilometers under the desert."

"So it may be related to a larger ancient water system called the Taman-Lassett Valley."

"But it's not necessarily, it may not be an underground water system, but the Nile River has infiltrated this side."

After falling from the ground, the corridor is much wider and can be walked upright, but you can reach out to the top.

The width is about one meter or so, and it is difficult for two people to pass by at the same time, but for Bi Fang personally, this size is more than enough.

After walking for about twenty meters, a corner appeared in front of him.

"There is no fork in the road."

Bi Fang was thoughtful.

"This should be a 'mastaba'"

[Master Eight? 】

[What is this?] 】

[Let's talk about it quickly, did Fang Shen find something? ] 】

Bi Fang brought the torches close to the walls of the corridor, all of which were made of mud and stone, and were covered with strange patterns.

In a dark environment, it looks very weird.

"'Mastaba,' a transliteration of the Arabic word meaning stone bench, was originally used in the form of ancient Egyptian dwellings and later in the form of burials of the nobility before the Old Kingdom of Egypt."

"When the pyramids appeared, this form became a tomb for the common people, of course, it is said that the commoners, who can afford this kind of tomb, at least the rich class."

【Before the pyramid?】 】

[I thought pyramids had been around since ancient times]

"Do you think that the pyramids were born? It's just an evolution, and the original foundation is the mastaba, which is like a pyramid with no spire, only a pedestal. ”

The original Egyptian tombs were mostly built of mud and stone, in the shape of a trapezoidal hexahedron, and were divided into two parts: the catacombs and the above-ground sacrificial halls.

Tombs generally have numerous burial chambers, which are used not only for the body of the deceased, but also for the body of the person accompanying the burial.

There were also burial chambers for food, utensils and clothing, and in the Old Kingdom, kings began to use pyramids instead of mastabas as burial forms, from which the earliest pyramids evolved.

"Archaeological excavations have revealed that the most central part of the mastaba, built during the First Dynasty, is a rectangular pit located under the surface, which is divided into five small chambers, and the large chamber in the middle is used to store the dead."

"The adjoining four small rooms are the belongings of the deceased. The pit is covered by nine rows of three-longitudinal cubicles made of mud bricks, and then covered with sand and dirt. ”

"You see, we've just turned two intersections, and we're just surrounded by a small house."

Bi Fang then walked forward, came across the third intersection, and then walked forward, just in time to see a pinch of arrow-shaped gravel left on the ground earlier.

Fearing the destruction of the ruins, Bi Fang did not carve anything on the wall as a mark, but grabbed a handful of sand and put it in a bag, spilling an arrow on the necessary key parts.

Seeing the arrows on the ground, the audience suddenly realized.

In this way, Bi Fang did go around in a circle just now, and this should be a small room.

"If it were a pyramid, there would not be small chambers like this, but only a few burial chambers, followed by straight passages, and it would be impossible to build small chambers in it."

"However, a room is so big, there must be a big man buried here."

Now that he knew what this place was, Bi Fang was no longer so nervous, and carefully observed the paintings on the wall.

"Anyone who knows a little about ancient Egypt must know the beliefs of the ancient Egyptians."

"They believe that after death, if the body of the soul is preserved and does not decay, it will be resurrected to eternal life in another world after 3,000 years."

"So from the early dynastic period and into later dynasties, the Egyptians worked to develop better and more sophisticated methods of burying the body, and the main purpose of housing the dead was to protect the body from outside harm."

"The earliest way for the ancient Egyptians to bury a corpse was to dig a simple pit in the sand and put the corpse in the tomb along with personal belongings or useful items in the afterlife."

"Due to contact with the dry desert, the corpses were naturally preserved, but they were threatened by some underlying factors."

"As a result, mastabas were created to protect the human body from wildlife and potential robbers."

"But the mastaba did not protect the human body as naturally as sand, which led the Egyptians to develop the mumminage system through artificial means."

The early pharaohs of Upper Egypt were buried in the burial ground of King Abydos, and the first basements were made of mud bricks, with dense tree trunks on the roof, and wooden planks on the ground and walls.

Later, it was developed to use stone as a face and paving, and a small room for tribute was added to the east side of the tomb.

The mound is a sand dune enclosed by a wall, and the outer layer of the low wall around it is lined with the tombs of family members and dignitaries, forming the early mastaba tomb.

Bi Fang walked along the corridor, looking at the scale of this mastaba.

"With such a large size, it is certainly not an early riser, and it should be quite close to the era when the pyramids were used as tombs."

"This twilight structure probably came from Mesopotamian ideas, as this civilization was building similar buildings and structures at the same time."

[Awesome, Fang Shen is really learning from the past and the present! ]

】

[Write a book, Fang Shen, I think you can]

【I want to see】

[I want to see plus one]

[Wait, since it's a tomb, isn't there a lot of funerary goods (dog heads)]

[, isn't that getting rich? 】

[Fang Shen also dug up a golden mask and came out! ] 】

Hearing that there might be a treasure, many viewers immediately became excited, and they all urged Bi Fang to look for it.

Bi Fang was speechless.

"If I find it, it can't be mine, and I'm not a robber."