As early as last month, the frontline research institute of the colony and the laboratory of Celestial City jointly studied and finally found a suitable frequency.
Through the magically modified seismic wave excitation device, twelve seismic waves of different frequencies were continuously emitted to the ground to create a "black field" within a range of ten kilometers underground. In this black field, Devil Worms could not correctly determine the direction, the surrounding environment, and the situation on the surface. At the same time, they would experience strong physiological discomfort.
Experts from all over the world in the laboratory called it an ultrasonic fence.
Twelve seismic wave excitation devices were deployed around the colony, and the entire colony was surrounded by ultrasonic waves to form a dodecagonal wall. Now, with the colony as the center, within a radius of more than ten kilometers, it had become a restricted area for Devil Worms.
Thanks to this, the colony development work that had been stagnant for a long time could finally be restarted.
Under the command of Captain Hong Zewei, the colony's engineering team repaired the hydroponic plantations and pastures that were riddled with holes by Devil Worms. At the same time, according to the plan of the Space Command Center, the first highly automated steel plant was built on Mars.
Mining iron on Mars did not require a mine at all.
Mars was full of iron ores.
This sentence was not false at all.
Pick up a handful of sand from the ground and you could smell the rust.
The raw materials for production were right under their feet. The newly built iron mine only needed to shovel the sand into the boiler to produce batches of finished steel. Most of the slag after smelting was silica, which could be used as a building material for glass and concrete after a little processing.
Some of the steel produced was used for the construction of the colony, while the other part was made into rebar and stainless steel plates to reinforce the surface of the colony.
Yes, the steel on Mars was cheap enough to be used as floor tiles.
The engineering team responsible for the construction would first drive steel bars into the ground, then fill them with cement, pour them into a concrete foundation, and then lay a layer of high-strength stainless steel on the concrete floor. In this way, even if the Devil Worms grew a drill on their heads, they would not be able to penetrate the floor of the colony.
Although there was an infrasonic fence, most people would still feel uncomfortable when they thought about the tunnels dug by Devil Worms under their feet. Even just in case, this layer of alloy floor was absolutely necessary.
In addition, the sound insulation effect of the concrete was very strong and could effectively limit ultrasonic waves underground, which was also beneficial to the health of the colonists in the colony.
In addition to iron ore, the geological team that Wang Qiang was in recently discovered a considerable carbon mine in a crater ten kilometers away from the colony. This kind of natural carbon ore was rare on Earth, but it seemed to be very common on Mars.
Relying on the graphite produced by this carbon mine, the colony could now produce graphene independently without relying on imports from Celestial City.
The steel plant and graphene factory had been built. Now, there were only two tasks left for the colony from the headquarters. One was to build a ground base station for the space elevator on the equator line, and the other was Project 071.
Now, Celestial Trade Marines had established a base of operations above Mine 071. The construction team of the colony reinforced the road with concrete and steel. At the same time, they also built machine gun sentry towers, communication base stations, accommodation barracks, garages, and other facilities.
In addition, the drilling rig of the engineering team had drilled a tunnel around Mine 071 that could accommodate armored vehicles. The walls of the tunnel were reinforced with reinforced concrete to prevent Devil Worms from destroying it.
Drilling the tunnel to five kilometers or even deeper was undoubtedly a test for the construction skills of the colony's engineering team. However, they had experienced this test many times. After more than a month of hard work, the drilling rig finally drilled to the edge of the Gaia civilization ruins five kilometers below.
The next thing they had to do was to drill down around the ruins and create a spiral tunnel. After determining the level of the Gaia civilization database, they would dig into the ruins.
"This is Team A, we have reached the edge of the unknown area."
Following behind the drilling rig, Zhang Hai looked at the map on the holographic screen inside the helmet and reported the current situation to the command center.
"Move forward."
"Roger." After ending the communication with the command center, Zhang Hai switched the communication to the team channel, set up the rifle in his hand, and aimed at the tunnel ahead. "All combat units, attention, a high-density life signal has been detected ahead. We are about to enter the danger zone. Protect the drilling rig, open the safety, fire freely, move. "
The drilling rig continued to move forward, and the engineering vehicle behind welded the rebars on both sides. At the same time, quick-drying concrete was poured to strengthen the tunnel. The Marines followed closely behind with Gauss rifles in their hands and carefully monitored the front.
If Devil Worms might attack from a certain direction, then it must be right in front of the drilling rig.
When the drill bit drilled through a rock wall, the rock in front collapsed and revealed a large space. The drilling rig stopped, and the soldiers on both sides immediately moved forward, but they did not find any trace of Devil Worms in the hollow layer.
Zhang Hai walked to the nearby rock wall, turned on the tactical flashlight, and found the flesh-red rock, as well as the bacterial flora growing on the surface of the rock.
There was no doubt that this was the oxygen supply layer.
Making a gesture to the soldiers behind him, Zhang Hai and his men carefully retreated into the reinforced tunnel. At this moment, a soldier accidentally discovered a strange follicle.
The dark green follicle looked half the size of a person, and a thin layer of colorful oil spots could be seen on the shiny membrane under the flashlight. According to some unknown rhythm, the follicles contracted and swelled slightly.
Perhaps it was because of the flashlight that stimulated it, the speed of its agitation slightly increased.
"What is this?" With the rifle in his hand aimed at the egg, the soldier pressed on his helmet, took a few photos, and sent them to the team channel. "Captain, we found a situation here."
"Devil Worm egg?" Looking at the image on the holographic screen, Zhang Hai frowned slightly and walked forward with the rifle. "No … let the drilling rig stop."
The drilling rig stopped moving forward.
Soon, Zhang Hai re-contacted the command center.
As soon as the communication was connected, the command center asked.
"What happened? Why did the drilling rig stop? "
"Reporting, this is Team A. We drilled through a hollow layer and found a large number of oxygen-producing fungi and a strange insect egg … probably an insect egg." Zhang Hai looked at the bulging follicle and sent the photos to the command center of the TS Expedition.
"This is the command center. We have received the information and are sending researchers to the target area for sampling. Please wait here for a while."
"Roger that." After hanging up, Zhang Hai gestured to the soldiers behind him and pointed to both sides of the drilling rig.
Before the researchers arrived, they would set up a simple line of defense here.
"What do you think this thing is?" Koenig whispered in the communication channel as he nervously aimed at the egg.
"I don't know, maybe it's a mutant Devil Worm? Maybe it's a new species that we haven't even seen before? To be honest … I've even seen that kind of thing. Even if God stood in front of me, I wouldn't be surprised. "
Listening to the chatter of his teammates in the communication channel, Zhang Hai looked at the egg.
The insect egg was like a living heart, pulsating according to a special rhythm.
He did not know why, but when he looked at the egg, he could not help but feel a strong sense of uneasiness …
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