The sun sets, but the world does not fall into darkness.

Beside the campfire, Bifang was cutting tree sticks, peeling off the wood chips layer by layer, and then poured them into a cylindrical bark container.

After tamping the layer of wood chips, Bi Fang picked through the campfire and selected several intact pieces of charcoal. After cooling, he crushed them and poured them into it.

After making multiple layers and multiple times, a simple disinfection mask is completed.

The fat in the ostrich meat was boiled into grease. Bi Fang tied a piece of hemp rope tightly to half a wooden stick, then soaked it in it. After the rope absorbed enough oil, he inserted it into the bonfire.

The fire snake wound up, and within a moment, a torch head was completed, and the blazing flames illuminated the surrounding area brightly.

After extinguishing the bonfire on the spot with water, Bifang came to the dark entrance of the cave.

The firelight illuminated the surroundings of the cave entrance, but made the cave itself even darker, like a black hole that preys on people, which can't help but make people a little scared.

Bi Fang, who put on a gas mask, was still not in a hurry to enter. He first placed the torch in front of the cave entrance and waited for about a quarter of an hour. During this period, he went deeper and deeper until the entire torch was inserted into the cave.

"If it can burn, it means there is oxygen inside. There is no violent combustion, which means there is no flammable gas inside. It is safe to bring a torch in."

Bi Fang gave a brief explanation.

[Another small detail]

[Thin, really too thin]

[I doubt your swearing, and there is sufficient evidence (dog head)]

Fully prepared, Bi Fang looked at the cave illuminated by torches, lay down, and crawled in little by little.

The cave itself is not big, the diameter exposed on the surface is even less than half a meter, and it is difficult to enter without getting down.

Orange light illuminates the passage, and every square inch is filled with thick gravel, the remnants of what was originally poured in.

【feel a little scared】

[After watching too many horror movies, I always feel like something will pop up in front of me]

[It would be most disturbing if a rattlesnake or something jumped out at this time]

[Fang Shen: I thank you]

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

"The inclination angle is about 30 degrees. We can judge how many meters we have advanced by making marks, and then calculate our depth."

"Now, we have sunk about five meters, which shows that this ruins is much larger than we thought, and it is most likely not an undiscovered pyramid."

Bi Fang lowered his voice. It was quite hot inside and he was wearing a gas mask. His breathing was not smooth, making him breathless.

The surroundings of the corridor also began to change. It was no longer completely gravel, but mixed with a lot of flint, and even complete huge stones.

Moreover, the size of the passage also changed. Bi Fang was able to switch from lying on his stomach to explore to squatting. However, squatting was too strenuous, so he still chose to crawl.

[Why it can’t be a pyramid]

[The signal of this drone is really good]

【High quality Tan Ge nb】

"Because the shapes of all pyramids are fixed, the length of the square side at the base of the pyramid multiplied by two, when divided by the height of the pyramid, is approximately equal to 3.14, which is π. They are all proportional."

"Judging from the size and depth of what we have discovered so far, if it is really a pyramid, then the height of this ruins is at least more than ten meters. However, after I entered through the passage, the total descent height was less than five meters."

"This means that more than half of this 'pyramid' has been cut off. The probability of this is very, very small. We can't imagine what it has experienced before to be destroyed like this."

The pyramid is very sacred in the eyes of the Egyptians. It is not only a symbol of royal power, but also linked to religion and theocracy. In various wars in the West, invaders may destroy the capital left by the previous dynasty, but rarely

Will destroy churches unless they are pagans.

Even as Bi Fang mentioned before, in the 14th century AD, Sultan Badr al-Din Hassan of the Bahri Dynasty removed the surface limestone on the pyramid in order to build a temple, but he did not think of disturbing the entire pyramid.

The pyramid has been eroded by wind and sand for thousands of years. This erosion is all-round. It is impossible to completely erode more than half of it, leaving only a complete base. Moreover, the wind and sand are not so violent.

Climb along the passage until you have dropped about six meters. The slope of the corridor ahead suddenly increases. In just a few meters, it changes from a small slope of 30 degrees to a super steep slope of more than 60 degrees.

The slope was more than 60 degrees, and it was impossible to stand without stairs. Bi Fang supported the wall and began to accelerate down.

The depth of the slide this time was beyond everyone's expectations. The slope became steeper and steeper, and finally it was almost a 90-degree vertical drop. If the passage was not narrow enough and could be supported by the legs, it would have almost fallen.

"Wow!"

A dull sound echoed in the ruins, and a large amount of fine sand fell down along with a figure, pitter-pattering and jumping.

In the darkness, Bi Fang, who was holding a torch, fell to the ground, and a large amount of dust rose up, temporarily blinding his vision.

【I'm coming】

【High energy ahead】

[I finally came in. It’s too narrow. If it wasn’t slippery enough, it would definitely be uncomfortable to go in. 】

【The King of Talkers】

【So dark】

"Finally came in."

Bi Fang, who was wearing a gas mask, slowly stood up from the ground without being choked by the smoke. He patted the sand on his shoulders, then took off his shoes and poured out all the sand.

"I was really shocked just now. I didn't expect the ruins to be so deep."

Bi Fang raised the torch above his head and could still see the dark tunnel. His brief descent allowed him to go more than twenty meters underground.

"The Sahara Desert is mainly composed of rocky Hamada and sandy land. Many sand dunes are over 180 meters high, with the average height around 150 meters and the highest even over 300 meters. Although it is not as deep as the sea, it would completely submerge a city at such a depth.

enough."

Holding a torch, walking among the deep ruins.

More than twenty meters deep, there is no light source here. Except for the torch in his hand, everything is pitch black, which is enough to make any normal person fall into claustrophobia.

[Cao Cao Cao, I can’t handle this environment anymore]

[Every time I see this kind of person holding a torch in the darkness, I would rather not have this torch. It becomes the only light in the darkness, which is particularly eye-catching and feels even more terrifying]

[Plus one, like a moth to a flame, the creature in the shadow likes the light the most (dog head)]

"Tick tock."

The falling water droplets were magnified countless times in the silent environment.

Bi Fang walked forward following the sound, touched the wall next to him, and felt the moisture on his fingertips.

There is thick water vapor in this ruins.

Rubbing the wet gravel on his fingertips, Bi Fang explained.

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

"But we are quite close to the Nile at this time."

"Geologists had studied windblown sediments, sediments produced by flowing water, and then, with the help of aircraft radar, saw images of bedrock near the Nile."

"By combining data from space shuttle terrain survey scans with ground samples, geologists estimate that the Nile River once flooded Egypt's Kiseba Depression, forming a giant lake of 42,000 square kilometers, which later became a buried lake.

Ancient river channel.”

"These paleochannels were periodically activated as river systems during climate warming cycles, and recent algorithmic analysis shows that they ended 6,500 years ago and are still back underground today."

"The research team at that time conducted further investigations and estimated that the river extended for more than 520 kilometers under the desert."

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

"But it's not necessarily certain. It may not be an underground water system, but the Nile River penetrates here."

After falling from the ground, the corridor is much wider and can be fully used for people to walk upright, but they can reach the top with their hands.

The width is about one meter, making it difficult for two people to pass by at the same time, but for Bifang personally, this size is more than enough.

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

"There is no fork in the road."

Bi Fang was thoughtful.

“This should be a ‘mastaba’”

【Master Eight?】

【What is this?】

[Come on, tell me, did Fang Shen discover something? 】

Bi Fang placed the torch close to the corridor wall, which was made of mud and stone and covered with strange and strange patterns.

In the dark environment, it looks particularly strange.

"'Mastaba' is a transliteration of Arabic, meaning stone bench. It was originally used in the form of residences in ancient Egypt, and later in the form of tombs for nobles before the Old Kingdom of Egypt."

"When the pyramids appeared later, this form of burial became common people's tombs. Of course, the people who can afford to build such tombs are at least the wealthy class."

【Before the Pyramid?】

[I thought pyramids had appeared since ancient times]
To be continued...