After Zheng Yi and Niu Wang retreated into the tunnel, the monsters gathered outside the range of the purple light, roaring as usual but not approaching.

The Bull King exhaled heavily, inspecting his armor and protective clothing, and was surprised that he had not been damaged in the slightest.

This is the great doctor in Sequence 6, and he is really powerful.

You must know that in this kind of underground site, the most feared thing is that the protective clothing will be damaged. An ancient refuge without an ecosystem, the temperature is close to 100 degrees, and the pressure is up to hundreds of atmospheres. If there is a leakage fracture and there is a crustal cavity near the fracture, it will cause a high temperature of more than 200 degrees locally.

Zheng Yi glanced at the gloves, the black had just been stained with three fingers, which was far from enough. However, he didn't force it anymore, after all, the Bull King had a very general relationship with him, and the other two Sand Ranger rookies were also a little unreliable. Their people on the surface of the earth have come out with moths.

The two of them quickly walked through the tunnel and returned to the starting point.

Asa was already able to stand up, the green crystal ball in his hand emitting a terrifying green light. There was an extra corpse on the ground. In Zheng Yi's professional eyes, this is a corpse, and for ordinary people, this is a lump of rotten meat.

"What's going on?" The Bull King strode forward, his voice stern.

Asha said, "When we came over, we found him...... It was thrown down. The lifter was taken away. ”

The fluorescent rope that had been hanging down was gone, and it was black on the top, I don't know if it was because it was not yet dawn, or if the people above were not doing anything, and even the entrance to the cave was blocked.

"Hmm......" Asa let out a muffled grunt, the crystal ball in his hand dimmed.

"What's going on?" Asha asked.

Asa gasped for breath twice and said, "They were attacked, and all three died. After he was forced to confess, he was thrown into the passage. ”

King Niu smashed his fist on the wall of the cave: "Who did it!" ”

Asa was obviously tired, and slowly sat down against the cave wall, regained his energy, and said after a long time:

"I don't know, his soul dissipates quickly, and I only saw the group of people wearing black leather clothes."

Asha turned around, pressed her forehead against the warm cave wall, and gave her two gentle strokes.

Zheng Yi lay down on his back, and the beam of tulips rushed straight up. Its prototype is a satellite marker light, which is composed of laser lights, which are enough to pierce the complex atmosphere and transmit light to the ground. This channel well is only 5 kilometers long, and the environment is stable, there are no clouds and air currents, and it is easy to shoot upwards.

"It's blocked up there."

Zheng Yi confirmed with a beam of light and told everyone the news of this tragedy.

King Niu suddenly let out a wild laugh and said, "It's okay, I'm not a rookie." I had my brothers with us, and they would have rescued me. ”

Zheng Yi said: "I hope your brothers are true brothers. ”

"What do you mean!" The Bull King said angrily.

"That stone is stuck in the middle of the passage, it can't go up or down." Zheng Yi visually measured the distance just now, and the stone was located in the middle of the passage. The murderers above did not improvise to kill a few people to rob the car, but were determined to close the passage and trap the people inside below.

"These two girls are so stupid, where can they find such a fierce enemy? And you let your brothers follow...... Don't you think it's too coincidental that in the wilderness, two teams of people just met so accurately? Zheng Yi said.

The Bull King suddenly threw a punch at Zheng Yi.

Zheng Yi wore a three-layer shield, not dodging or dodging, just like a breeze blowing on his face.

The king of the bull turned around and pounded the wall of the cave, and the high-grade reinforced cement was cracked.

"We're going to be trapped to death...... Asha looked desolate, "the water and food are on it." ”

Because those monsters can't explore for too long, they have to fast in and out, so water and food are ineffective loads and are left on the surface.

"Can a Sequence 6 warrior smash through a stone about three meters in diameter?" Zheng Yi asked.

"How to borrow?" The Bull King calmed down and gasped.

Climbing two or three thousand meters of the cave wall is already very challenging, and with no focus point, it is really difficult to attack the rocks on your back. It's more likely to fall off and turn into pâté, but it seems like it's going to be easy.

"Then we'll have to find another way." Zheng Yi said: "Although everyone enters and exits from the 'thief hole', there should be an entry and exit channel for this base itself, and maybe there is more than one." ”

"This is a pre-cataclysmic site." Asa relieved himself and said, "At that time, the ancients used rail transit to connect to the earth's surface. ”

"They have elevators, so why bother digging tunnels." King Niu asked.

"Large carrying capacity." Zheng Yi gave a reasonable explanation: "And cheap." ”

The king of the bull does not express his opinion, he reads less books, and it is better to express his opinion less under this kind of topic.

The technological level of Zheng Yi's hometown is slightly similar to that of the two hundred years before the cataclysm here, so he can be regarded as a person with the thinking of the ancients. At that time, the ancients did not have the technology and almost unlimited energy, so in large-scale engineering projects, the cost and construction schedule must be considered.

At the same time as the main body of the building is carried out underground, a transportation tunnel is built on the attached land, which on the one hand facilitates the transfer of building materials, and on the other hand, it also facilitates the supply of a large number of materials in the future. In addition, human society at that time was not dominated by underground living, so it was also necessary to consider the external commuting of workers.

Zheng Yi drew three circles on the cave wall with the tail end of the tulip and explained:

"The very center is the internal elevator, which is the column; We should be in the inner ring now, where the work, life and rest areas should be. Then there must be an outer ring that is the main external commuting thoroughfare.

"It should form a spiraling highway around the interior space, and it should be built to a higher specification than the inner ring for safety and accident reasons. Since the interior is still intact, the exterior is no problem. ”

"We have to do it as soon as possible before we run out of energy." King Niu took a deep breath: "Let's go!" Get out of the way first! ”

The three-meter-tall warrior held a double axe to hit the head, Zheng Yi ranked second, and the two women followed last. The four of them walked out of the tunnel, and the monsters outside had not yet dispersed, and they were trying to overcome their instinctive fear to challenge the purple light.

The bull king, who was betrayed by his brother, suddenly found an outlet for his emotions, and went up with a double axe and cut down four of them.

Zheng Yi was finally relieved to see that the black lines on the gloves continued to grow. Although the process was not perfect, the results were acceptable.

"We walked close to the side, looking for a passage to the depths, where the outer ring should be connected." Zheng Yi said.

This task is more arduous. No one knows if there is still a danger lurking on this level. In order to avoid unnecessary attrition, the Bull King is responsible for suppressing the monster frenzy, Asha guards his flanks with ultraviolet lamps, and Zheng Yi takes on the task of searching for the channel.

It will not be easy for Asa as long as he can live well.