Suddenly saw a skull, Du Yuhan was startled. It's almost out of the mountains here, how can there be a skull and skull, could it be someone who has been eaten by wild beasts?

Du Yuhan took a closer look and found that there were not only skulls here, but also other human bones.

Du Yuhan was bold enough to use a wooden stick to push through the surrounding grass and found that a lot of white bones were faintly exposed to the ground. She saw several skulls.

Du Yuhan frowned and looked at the situation around him, and the more he looked at it, the more shocked he became.

If there is a person here, it is possible that the person who entered the mountain accidentally encountered a fierce beast and was eaten by the wild beast. But now that there are so many people's bones together, it has to make people think a lot.

Looking at the situation in front of him, Du Yuhan didn't know how many people were still buried underground, these people should have been buried here indiscriminately, under what circumstances could this situation occur?

She saw a hole in the skull, and in the skull there was a bullet, and it seemed that the man had been shot dead and buried here.

Du Yuhan frowned and thought about the possible situation. Could it be what happened when country R invaded their country.

It is very likely that these people were slaughtered by the people of R and buried here casually. Originally, it was not buried deeply, and after a long time, the human bones were exposed to the ground. So what is the circumstance that so many people were slaughtered together?

Du Yuhan also saw an iron pickaxe and an iron shovel next to the human bones, which were used to dig the ground and engage in construction.

Du Yuhan thought of a possibility, these people were very likely to be arrested to build some kind of project, and after the project was completed, these ordinary people involved in the construction of the project were killed in order to keep it secret.

It is very likely that the cruel style of country R will be.

Du Yuhan often sees such a scene from the TV series in the future, the invaders of country R do not treat the people of country Z as people, and they arrest the people of country Z to build secret fortifications, and after they are built, they kill those people for secrecy.

The scenes in the TV series seem to be very similar to the current scene. Could it be that there are some secret fortifications left by country R in this vicinity? Otherwise, this iron pickaxe would not have been able to carry with you, and it is very likely that the building is nearby.

Du Yuhan's heart beat a little fast, this place itself is not very far from the border, and it is very likely that there is something left by country R.

Du Yuhan is not in a hurry to leave, she wants to explore here, maybe there will be unexpected discoveries.

There are many instruments in Du Yuhan's space, many of which are the most advanced instruments in the 21st world in later generations.

Du Yuhan took out a metal detector from space, which can accurately detect the existence of some specific metal substances within a certain range.

After Du Yuhan turned on the detector and set it, he found that the detector immediately reacted. However, she found that the detector showed the pickaxes and shovels she had seen.

Du Yuhan probed around little by little, and after leaving the iron pickaxe and shovel at a certain distance, the detector no longer responded.

Du Yuhan probed around here like this, and increased the detection range little by little.

However, a day passed, and Du Yuhan did not find anything abnormal within a radius of one kilometer.

Du Yuhan muttered in her heart, could she be wrong? There is no secret here?

Du Yuhan didn't give up, she expanded the scope of detection.

It was about to get dark, and just when Du Yuhan was about to give up, the detector suddenly reacted.

Du Yuhan looked refreshed, and according to the display of the detector, she found a cave with a small entrance. The cave is hidden by weeds and trees, making it difficult for ordinary people to spot.

Du Yuhan peeled aside the weeds and bushes, lowered his head and went into the cave, turned on a strong flashlight and shone inside.

The cave I saw when I first entered the cave was not large, it could be said to be very narrow, and it could only accommodate two people walking side by side, like a passage extending inward.

There are no traces of artificial excavation in the walls of the cave, everything is natural, and there is nothing unusual here, just like an ordinary cave.

Du Yuhan didn't know if there would be anything to be found in the cave, but he just went inside to explore.

Du Yuhan flashed a flashlight and walked boldly inside, and after walking through a narrow cave like a passageway, the inside suddenly opened up, and it was a relatively large cave with dozens of square meters.

Du Yuhan searched around the cave with a flashlight and found nothing abnormal, except that stones were stones, and there were no traces left by man.

But after Du Yuhan carefully checked it with a flashlight, he found traces of man-made. However, this place may have been deliberately arranged so that it looks natural, like a natural cave, and no one will find out that there are any secrets here.

Du Yuhan's heart was pounding, maybe she was about to make some huge discovery.

She pulled out the detector again, and the detector reacted even more, indicating that this place was not as simple as it seemed.

According to the response of the detector, Du Yuhan came to one of the walls of the cave. Holding a flashlight, Du Yuhan looked at the wall and touched it, and the potholes were the same as the natural cave walls, nothing special.

Du Yuhan didn't give up and looked at this wall and groped carefully, but he still didn't find it. She squatted on the ground again, groping carefully with her hands to dig the dirt on the ground.

Eventually, she found something smooth to the touch in the bottom of a cave next to the wall.

Feeling the feeling in his hand, Du Yuhan was pleasantly surprised. She took out a small shovel for planting flowers and carefully peeled off the soil on the ground little by little, and swept the floating soil away with a broom, until finally a disc-like thing was revealed.

The disc is made of metal, and in the center of it is a smaller disc embedded in it. The small disc is not flat, it has two grooves on it.

Du Yuhan put a few fingers into the groove, and the small disc rotated as soon as his hand was forced. After a few twists of the small disc came down, it turned out to be a lid.

Underneath the round lid was a metal ring, which seemed to have something attached to it.

Du Yuhan held the metal ring in her hand and turned around but didn't react, she pulled it hard, and suddenly the metal ring was pulled up, and there was an iron chain attached to it.

As the metal ring was pulled up, there was a sound in the cave. It was a rumbling sound. In front of Du Yuhan's right, the walls of the cave began to move, and after a short time, the moving walls stopped to reveal an iron gate behind them.

The iron gate was locked with a large lock. As soon as Du Yuhan saw the big lock, he took out the master key and other tools from the space, and opened the big lock very easily.

After taking off the big lock, he pushed open the heavy metal door, and Du Yuhan explored and entered the door with a flashlight.