There is nothing noteworthy about the fire fold, what attracts Lin Congfeng is a large hole in the light of the fire.

In the wall of this well, there is a cavity that resembles an entrance.

The hole is small and irregular, and it should have been violently broken open from the inside.

Lin Congfeng looked up at the mouth of the well, and walked towards the big hole.

At this time, he was very worried about Lin Jiu, but in the current situation, he couldn't go up at all, and if he acted rashly, it would only cause more serious consequences.

It is impossible to say that it is possible to return to the surface through this hole, although this may not even be believed by Lin Congfeng himself, but now he has no other better choice.

Lin Congfeng picked up the fire fold and turned off the copper flashlight on his body.

He still has a few more on him, but the light source of the flashlight is too precious, and he only has two spare batteries in addition to the ones he is using.

The light produced by the fire fold was really limited, which made it impossible for Lin Congfeng to carefully observe the details of the cave entrance.

If he looked closely, he would see that the hole was not broken from the inside at all, but was intended to be sealed from the outside.

But for some unknown reason in the process, the work was extremely flustered and not completed, so this irregular hole was left.

Lin Congfeng wanted to use the sapper shovel he carried with him to clean up the hole.

As a result, after two attempts, I found that the entrance to the cave was unusually strong, and even a piece of masonry was difficult to break.

He looked at the hole again, but found that it was not cement, but an unknown material, and he could hardly imagine why it was so strong.

In desperation, I had to give up, but fortunately, the hole was big enough for the child.

Lin Congfeng carefully climbed into the cave and raised the fire fold in his hand, he found that the space inside was very large.

At least for the child, the big one surprised him.

This is similar to a large hallway, almost two meters high and one meter wide, and there is no problem with walking an adult.

The rich space does not cause discomfort, and the entire wall and even the floor are covered with a flat coating.

The material is still the same as that of the hole, and in his opinion, it is even stronger than modern concrete.

It must have been a huge undertaking when it was built.

It is impossible for someone to make such a big move under the nose of the family.

That is, everything here is done by the family.

The light of the fire fold is very faint, Lin Congfeng can't see how long it is, fortunately, there is no fork in the road at all, as long as he keeps going.

In this passage, Lin Congfeng's breathing did not have any discomfort, indicating that the air here was quite OK.

There must have been a well-preserved ventilation system here, and it was built with great care.

This means that the purpose of the entire project at that time was long-term, at least in years.

What Lin Congfeng didn't know was that not only the ventilation system, but also the drainage system was very perfect, and there was a huge formation in the deeper underground, and the amount of work in this formation was even greater.

At that time, the family used a lot of resources to build this place, and of course there were good reasons, even enough to the extent necessary.

Lin Congfeng measured the distance with his own steps, and walked about a thousand meters before seeing the end.

As he went deeper and deeper, Lin Congfeng felt that the temperature seemed to be getting lower.