The roads inside the cave also appear to be very complicated.

They had just entered the cave and it was relatively spacious. They could even walk through it four abreast.

But after a while, the cave entrance became narrower and narrower.

Now they had to form a single column, with Old Hei at the front.

If you continue walking forward, you will probably have to turn sideways to pass.

As we walked, the road became narrower, making it difficult for just one person to walk across it.

Just when they thought they were about to reach a dead end, the sound of water rushing inside the cave came.

They are no strangers to this sound.

Underground river!

The sound of water flow has a long history and is even more obvious in the cave.

However, they did not find the location of the underground river.

Because there is no road ahead.

They came to a stone door.

"What is this place?" Old Hei was confused.

Does the ancient city under the lake have no concept of urban planning?

They built a double-decker city, set up mausoleums at the bottom of the palace, and had secret passages everywhere.

Even a professional archaeological team would probably be confused by them.

In the current environment, you can only hear the sound of the underground river flowing.

But they finally reached a small goal. There must be a mystery behind this stone gate.

It's just that the entrance to the cave where the stone door is located is very narrow, so you can only go up and check it one by one.

Lin Ran noticed some patterns carved on the stone door.

It's more like a mark than a pattern, and it's already very mottled.

Judging from the appearance, it should be a totem.

It's just that the shape of the totem cannot be distinguished, it is not the common dragon and phoenix.

What is even more horrifying is that these marks still maintain a dark red color even after passing through the years.

This means that this kind of mark was probably carved with a knife and then filled with blood.

Just a cursory look at it made me feel a little creepy.

But judging from the lines, Lin Ran felt like someone was praying to the gods, and then a bolt of lightning fell from the sky.

He could only speculate to this extent, after all, the painting was too abstract.

It is estimated that only people from primitive society can draw it.After completing the observation, Lin Ran gave up his position to Wang Jinpeng.

Because he had checked just now, there was no mechanism to open this thick stone door directly.

Other methods must be used.

Wang Jinpeng spat in his hand and pushed forward.

But his face turned red and he still didn't push. The stone door didn't move at all.

Lao Hei also stepped forward and tried it, but there was no reaction.

"Let me do it." Wang Jinpeng was anxious and took out the shovel. If it didn't work, he smashed the stone door.

However, this method can consume a lot of time.

They had no time to waste here, so Lin Ran stopped him from doing this.

At this time, he noticed the lines on the stone door.

Lightning seems a little strange. Normal lightning is usually forked or chain-shaped.

This lightning is like a triangle.

No matter how rich the imagination of the ancients was, they would not have been able to create triangular lightning.

Could this be the mystery?

Lin Ran asked Wang Jinpeng to step aside and went to Shimen to conduct research.

The others seemed to have gotten used to it and were watching over Lin Ran.

No matter at any time, Lin Ran can give crucial opinions to the team.

They had developed unconditional trust in Lin Ran.

Lao Hei was watching from the side, and he was also thinking about what Lin Ran meant by the lightning patterns.

Is it a circuit diagram?

Lin Ran looked at the pattern on it and felt that it looked like a circuit mentioned in high school physics.

Could it be that this is an automatic door that can start to move as long as the current is connected.

This idea frightened him. Apart from time travellers, who else could make such a thing?

Is it an alien civilization?

All kinds of questions piled up in Lin Ran's chest.But at this moment, Wang Jinpeng heard a piercing sound that cut through the air.

"Danger..." Wang Jinpeng subconsciously stood in front of Lin Ran, and a spear passed directly through his cheek and hit the stone door.

However, this stone door was extremely thick, and the spear just hit it once, and then slowly fell to the ground.

This time, a trace of blood was left directly on Wang Jinpeng's face.

He didn't complain, but stared into the darkness.

His life was in danger, so he didn't bother saving the flashlight's power.

Just take out the flashlight and shine it into the darkness.

It turned out that there was a figure standing behind them.

In his hand, he held another spear, ready to throw it again.

Although the cave is narrow, he and Lao Hei are also very agile.

Old Black Heart understood, and before he threw the spear, he stabbed his hand with a flying knife.

"Ah!" The man actually let out a scream, then turned around and ran away.

"Want to run?" Wang Jinpeng definitely wouldn't let him go and trotted to catch up.

They only followed a few steps and came to the junction of the caves.

There was a strong sound of water here, and they couldn't determine the sound of footsteps. The person just now didn't know where they ran.

But judging from his wailing just now, it is very likely that he is a human being.

This way Wang Jinpeng and Xu Ning won't be afraid.

"Could they be the tomb-guarding clan?" Wang Jinpeng thought of the father and daughter he met in the tomb of King Zao earlier. They pretended to be gods and ghosts to scare the tomb robbers.

If so, they would be easier to deal with.

There is nothing you can do against monsters, but there is nothing you can do against ordinary people.

"You're a fast runner." Wang Jinpeng pinched his nose and said arrogantly.

There was a streak of blood on his face, but he didn't care at all.

Lin Ran was also a little confused, wondering what was going on?

There seems to be no food in the entire underground city. How can humans survive here?

Could it be residents of the villages outside?

This possibility is possible, but when they saw the tunnel, all intersections were closed.

All kinds of puzzles made him feel incredible.

Fortunately, the spear throw missed him.

Lin Ran thought to himself that if there were other people living in the dungeon, their presence would definitely be unwelcome.

Now we have to hurry up, either get behind the stone gate quickly, or go negotiate with the underground people.

Although he screamed just now, the screams were still somewhat different from those of humans.

Lin Ran's hearing was very good, and he felt that he would not make mistakes in judgment.

The other party may just be some kind of creature that looks like a human being, but it may not be a human being.

But being able to use weapons can be considered an improvement.

Although there are creatures alive, his intention to attack directly means that he comes with bad intentions.

If you continue to waste time with him, there will definitely be casualties.

And now that he's running away, he might be looking for reinforcements.

"Let's act quickly." Lin Ran urged.

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