Hearing this, Tietou stood there without moving, as if complaining that Lin Feng had made too hasty choices.

Avril's voice came from the phone. She heard the conversation just now and said, "Let's come over immediately and build a base No. 2 in your place. When we arrive with our equipment, you can continue moving forward."

Lin Feng responded, Fansheng walked back to the broken road just now, and observed the four holes with traces of people next to him.

As Tietou said, there are traces of hitting the mountaineering pickaxe at the four holes.

This shows that at least four waves of explorers died in the dark underground, but this does not prove that these four routes are incorrect.

Because they will also be trapped because there is a problem with the adventure equipment, or maybe it is because of insufficient food and equipment, and they will eventually be unable to obtain supplies.

Lin Feng carefully checked the grass and trees in front of the four holes, and did not even let go of a crack in the rock.

"The follow-up troops will arrive soon."

After Lin Feng finished the inspection, he arranged for a while, "Who among you still has the energy to go with me for a while? People without physical strength can stay here and wait for the subsequent team to come to take turns."

No one answered.

So Lin Feng started moving by himself, and he began to pack up his personal belongings and prepared to continue moving forward.

Seeing this, Tietou sighed and said, "Kaozi, stay with others, I will go with the boss."

Lin Feng stopped for a while, and when the iron head was equipped with the items, he took the lead and stepped into the dark unknown world.

In underground caves, soil and rocks play a strong role in absorbing radio waves. The radio communication equipment carried by ordinary expedition personnel is of low power, and because the design ideas are different.

As a result, in such a complex underground cave, even with high-power equipment assistance around it, the communication distance will not exceed two or three kilometers.

Of course, if these communication devices have large enough power, they can also achieve long-distance communication, but if the radio power is high, it will be harmful to the human brain.

Lin Feng and his team's itinerary have reached the limit of communication equipment. If you move forward, you will exceed the communication range, you will not receive any signals or any support support.

This is also because the mercenaries are unwilling to continue moving forward.

They are not losing their energy, they just hope to wait for the subsequent troops to come up and establish a communication transit point here before continuing to move forward.

But they didn't know that Lin Feng had another set of communication equipment, which was a set of communication equipment that would never be circulated on the market.

Lin Feng finally got something from the surviving clan. In order not to be too shocking, he did not mention it to the mercenaries.

The cave was very dry, without a trace of breeze, and it looked very dull.

Tietou followed Lin Feng for a long time, and finally couldn't help it. He asked, "Boss, Rome was not built in one day. We can't explore a good road in one day. Why not wait for the follow-up troops to catch up?"

Lin Feng did not answer.

Seeing Lin Feng continue to walk forward with his head in silence, Tietou said, "Look, we can't receive any signal at all now. Even if we die here, no one will notice it. Why not wait until the signal transfer equipment is built before leaving!?"

Finally, Lin Feng stopped and looked at the depths of the dark cave. In the dark, something seemed to be calling him.

The reason why he couldn't wait to move forward just now was because a mysterious signal appeared in his mind. This signal only existed for a second and then suddenly disappeared.

The one who received and transferred the signal was the Lyme belt on Lin Feng. Since entering the depths of the cave, the belt became active and sent some inexplicable signals to Lin Feng from time to time. It seemed that it became popular overnight, and it seemed to be chattering endlessly.

When the signal came just now, the mercenaries did not respond at all, and the ultrasonic waves and infrasonic wave detection instruments they carried did not respond at all.

It suddenly appeared and disappeared.

The Lyme belt indicates that the signal comes from here, from the depths of this cave.

According to the Lyme language, the signal seems to mean...

'quick'.

Quick? What? Should I leave quickly, come quickly? Or leave quickly?

"Can you go back now?" Lin Feng said calmly.

Tietou looked back and sighed. Although Lin Feng had marked all the way, he asked him to touch the mark and return to the starting point without any communication...

It would be better to continue following Lin Feng forward.

"Can't you go back? Then let's continue to move forward." Lin Feng got the answer from the other party's expression, so he raised his pace and continued to move forward.

Indeed, Rome was not built in one day. Lin Feng and Tietou walked not far away, and a huge stone wall appeared in front of him, a deep spring rippling on the stone wall, and there was a trickle of water around him.

"This is a dead end, and Morris has no record of having encountered the underground river." Tietou said with some sarcasm.

Since you can hear the sound of water, it means that the stone wall is not too thick. Behind the stone wall is a big river, and the vibration of the water sound is transmitted through the stone wall. Although the sound is very small, the cave is so quiet that it seems very clear.

Although Morris has not recorded the underground river, the signal just now came from this direction. Lin Feng was walking in a straight line. Perhaps, this is another correct route.

Otherwise, in this dark underground, who can send a signal that no instrument can detect?

Except for the mysterious ‘Golden Library’, who has this ability?

Thinking of this, Lin Feng walked to the puddle and reached out to test the depth of the water.

The water is very iced.

Then Lin Feng took off a magazine, tied it with a rope and threw it into the puddle until the rope reached the end and did not encounter any obstacles.

The length of the rope is three meters.

In other words, this puddle looks inconspicuous, but it is an unfathomable abyss.

"Damn it, it's a trap to him." Tietou shouted.

When I thought of someone who jumped down just now without paying attention, I might fall into a bottomless abyss. Moreover, the puddle is so small that there is no place to struggle.

I felt a little creepy when I thought of this.

However, Lin Feng didn't care and said calmly, "This is the right route." Without explaining too much, he directly expressed his judgment and spoke firmly.

With the prestige he has developed over the past few days, Tietou is also unable to express a question.
Chapter completed!