Chen Mulin stood at the entrance of the cave and hesitated.

Is it to go in?

Or is it a retreat?

Undoubtedly, returning from a long distance now will ensure a safe return to base.

But I was very curious, I wanted to know what was inside, but I was afraid of danger.

In the end, reason still failed to overcome curiosity, and Chen Mulin decided to explore the cave.

The so-called life and death have fate, wealth is in the sky, people can decide some things, but they can't change the final outcome.

If you really encounter any ferocious beasts, it depends on the will of God, even if you can't meet it now, you will encounter it in the future, and it is still necessary to find out the details in advance.

"I'm going in!"

Chen Mulin greeted and looked at the time, it was close to one o'clock in the afternoon, and there was still some time before the sun went down, so he could play to his heart's content.

Chen Mulin took a deep breath, strengthened his courage, and stepped into the cave with his feet raised.

After entering the cave, Chen Mulin looked around at the cave wall.

Unlike the last cave, there are no obvious signs of excavation, perhaps it is too old, or it is a natural formation.

Anyway, this passage is crooked, and it is absolutely impossible to dig it manually.

There were some obvious signs of activity on the ground, as if something was crawling over it regularly.

After going deeper for nearly 200 meters, Chen Mulin's signal began to be unstable, and the live broadcast was intermittent.

It's also annoying to watch it like this, so I simply don't broadcast it live, anyway, the signal will be interrupted as it continues to go deeper.

Chen Mulin stopped and said to the sailors: "Friends who watch the live broadcast, due to the unstable signal in the deep cave, in order to avoid reducing the viewing experience, the next is a long, long advertising time, let's see you in the evening!"

After speaking, he didn't wait for them to send a barrage to resist, and directly cut the live broadcast back to the base and asked them to count the rice.

In the end, one of the barrages that Chen Mulin saw was like this.

[Nima, you want us to count the rice again!]

......

Out of sight and out of mind, even if you see it, you don't see it, and now I feel relaxed.

Chen Mulin used a searchlight to shine into the depths, but because the passage was curved, the visibility distance was not far, so he could only continue to move forward.

After going about fifty meters deeper, Chen Mulin found that the passage began to tilt, and due to the angle, it didn't look obvious, but it could be felt slightly.

Chen Mulin muttered to himself: "Could it be that this cave leads to a deeper underground?"

Do you want to go any further?

Now that it is a few hundred meters deep, Chen Mulin tried it, but the signal has been completely interrupted, and neither the live broadcast room nor the rover outside can be connected.

If you knew that you were going to go into such a deep cave, you would have prepared a signal relay first, at least there was a signal, and you could ask the Xuannu if you encountered something you didn't understand.

Now that they have come to such a deep place, it is not good to give up halfway, so they have to move on.

Going deeper, the angle of inclination increased significantly, and according to the existing equipment, this is already thirty meters underground.

As he walked, Chen Mulin stopped, and the searchlight shone ahead.

There was a fork, and I don't know that there was a fork, there were as many as five, and they were all over the corners.

Chen Mulin stepped forward and found that the first fork was 90 degrees down, and even the searchlight could not illuminate it to the end, and it was an abyss.

Then there's the second one, which also extends downwards at a similar angle to the previous one, and this one can be seen to the end, but I'm just another corner.

Of the remaining three, one of them collapsed, and the other two were slowly sloping downwards and one slowly sloping upwards, similar to the passage that came in.

"Which fork in the road?"

"Or do you want to go back now?"

Chen Mulin fell into deep thought.

Obviously, it is impossible to choose two 90-degree downwards, except for the collapsed one, there is only one choice.

The upward passage seems to be the safest, but it is likely to be another exit, perhaps to the other end of the mountain, which one has accidentally crossed.

If you choose this, then you are likely to go for nothing.

Now there is only one path left that is best suited to move on.

Chen Mulin looked at the last fork, gritted his teeth and made up his mind, and after marking the passage he entered, he plunged into it.

Then Chen Mulin went through a lot of forks in the road, the situation was similar to the previous one, Chen Mulin chose to go down the best, did not hesitate, made a mark and continued to move forward.

......

An hour later, Chen Mulin couldn't remember how far it was, anyway, the depth showed that it was 300 meters underground.

"Record, now I've gone deep into an unknown distance, it's like a labyrinth, the passages lead in all directions, and I can't remember how many forks in the road!"

"Luckily, I didn't go through the same fork in the road repeatedly, that is, I didn't go around where I was, and that's the only good news right now. ”

Chen Mulin continued to go deeper while recording the information.

Suddenly, Chen Mulin noticed that the proportion of carbon dioxide concentration here began to decline, and although the oxygen content was still so untouched, the proportion of other gases was steadily rising.

There must be something here that has changed the proportion of atmospheric composition here, maybe it is the creatures that destroyed the unmanned rover 2.

Chen Mulin couldn't help but clench the shovel in his hand, and became more vigilant around him, for fear that an unknown creature would suddenly pounce in the next second.

He slowed down and walked slowly, glancing at the top of the passage from time to time.

There are a lot of horror movies and television works that are filmed like this, and suddenly something will fall on the top, or something will climb on it.

In this way, influenced by the film and television works he had seen before, he put most of his attention on it.

Suddenly, Chen Mulin chuckled, he seemed to have stepped on something, his heart was beating fast, and his eyes widened.

"Damn, you won't be so unlucky, will you?"

Sure enough, those unscrupulous movies are harmful, what is not good to make, but to make such a thing to mislead people, isn't it bad to make more literary films?

Now Chen Mulin didn't dare to move, for fear that his legs would be gone if he moved.

He only felt that his feet were soft and collapsed, and he couldn't feel what it was through the equipment.

recalled the moment when he stepped on it just now, and because of the reaction of his nerves, he lifted it up slightly when he stepped on it.

The feeling, how to put it, was sticky, thick, and a little moist, like stepping into the mud on a rainy day.

It's Mars here, and it's impossible for such a dry place to have such wet soil, or the kind of rain that it takes.

Of course, it is not ruled out that the surface environment will be humid, but the air humidity detected is still extremely low.

Excluding these possibilities, there is only one possibility, and this thing is left behind by a Martian creature, or it is simply a creature.