Near Mine 071.

Near the long-abandoned mine, there were a few new tire marks.

Two armored vehicles and a reinforced engineering vehicle were parked by the sand dunes about 100 meters away from the mine. The overturned rover was not far away, and traces of the Devil Worms’ bite marks were still visible on the chassis.

Zhang Hai looked out the window, then pressed a button on his helmet and got in touch with the coordinator on the Expedition.

“…we have reached the target area, requesting airstrike support.”

“This is the Expedition, the airstrike request has been approved, please place the airstrike beacon within 30 seconds.”

“Roger that.”

Soon, the top cover of an armored vehicle popped open, and a soldier leaned out half of his body, took a flare gun, and pulled the trigger at the dune on the other side.

The red beacon plunged into the sand dunes and transmitted coordinates to the missile that was falling from the synchronous orbit.

Soon, a black spot that dragged a long flaming tail gradually appeared in the sky.

Before the black spot became clear, the soldier got back into the vehicle and closed the top cover with force.

“BOOM——!”

The tremor was sent up from the ground into the vehicle.

The howling gravel blew the sands hundreds of meters away and covered the entire convey with a thick layer of sand.

Soon, from deep underground, there was another muffled noise.

The bursting flame engulfed all the tunnels inside and completely flushed out the area.

The convoy continued to move forward for about ten meters.

The engineering vehicle stopped first. The staff inside operated the robotic arm, took out a four-meter-long pyramid, and placed it on the sand. The two armored vehicles surrounded it while the electromagnetic pulse cannon on top carefully watched the surrounding for possible threats.

Their task today was very simple.

There was a total of four pyramids that must be pushed into the ground, then their mission would be completed.

“Are you sure this thing is really useful?” Inside the vehicle, Zhang Hai looked through the sight glass and watched the mechanical arm slowly push the pyramid into the ground inch by inch, as he couldn’t be convinced by the usefulness of this action.

“It is useful in theory.”

Wang Qiang, who sat across from the Marine Corps Captain, looked at the tablet in his hand, and while he browsed the manual data on the screen, he casually responded, “They are like bats at night, and all we have to do is get a few high decibel speakers, bury them into the ground, and make noise into the ground ten kilometers below without interruption for 24 hours. If I am those bugs, I will definitely not want to stay here.”

Celestial City Research Institute explained that the latest task of the front-line researchers was to find this frequency through trial and error.

These pyramids were originally used to survey and map the geological information of the mantle circle. After several researchers’ modification, they turned into a seismic wave transmitter used to make “noise” at different frequencies.

The nuclear fusion battery built into the “pyramid” could work till next year. The next step was to throw a life signal detector into the mine to detect the Devil Worms nearby. Therefore, they could detect the frequency of noise those bugs responded most violently to…

In addition, in order to prevent the bugs from destroying them, the construction vehicle also had to reinforce a few steel bars.

It’s that simple?” the Marine Corps soldier next to Zhang Hai asked with clear uncertainty in his tone.

He was a newcomer named Koenig, an immigrant from Italy, with the rank of corporal. He served as a commando in the team and replaced the wounded Sergeant Miller.

When they were on the Expedition, they used the training program in the Phantom helmet to simulate combat with the Devil Worms. In the simulation training, they were taught that any contact with the ground was fatal.

“It’s that simple.” Wang Qiang replied without much change in his emotion while his fingers quickly clicked on the tablet, he then looked at Zhang Hai, “Can I trouble you to move closer to there? There may be solar wind outside, my signal is terrible.”

“No problem.”

Zhangh Hai pressed on his helmet and ordered the soldier driving, and soon the armored vehicle drove next to the engineering vehicle.

The four-meter-long pyramid had been completely submerged in the sand, and only a platform less than a foot high was visible on the surface. In order to prevent this thing from being completely buried under the sand, the engineering vehicle also inserted a Xin flag on top of the platform as a marking

“Are you done?”

When Zhang Hai saw the robotic arm that started to retract, he asked Wang Qiang.

“One is not enough, we need about four,” Wang Qiang set the parameters on the tablet, and then pressed the start button, “We need to enclose the mine into a square, and then emit shock waves at the same time. We will use it collect the data.

“This thing is really that useful? Are you sure? I don’t feel any change at all.” Koenig doubted his remark.

“Because it emits ultrasonic waves, and because you are standing on top of the shock wave, the impact you’ll feel is at most your heart rate becoming half a beat faster,” Wang Qiang pursed his lips, then he put away the tablet. “If you stand directly under it, you will feel what is worse than death.”

…

At the first underground floor of Future Building.

After Jiang Chen walked out of the elevator, he followed Dr. Amos and they made their way to the lab.

“After you were in a coma that day, I lost the connection with the drone. At first, I thought the drone was broken, but then I thought about it, and the more I thought about it, the more I felt something was wrong. If the memory of Gaia civilization used our drone as a springboard to communicate with you, there is no reason it would destroy the drone.”

“So?” Jiang Chen asked.

“So, I wonder if the Gaia civilization made a small modification to the communication frequency of our drone’s communication chip through some special means. After all, our research on Klein particles is only at its infancy, but their technology was quite mature. If you want to plug the USB into a computer before 1994, you have to make a conversion interface or simply upgrade the hardware.”

Dr. Amos took out his ID card from his pocket, swiped it on the door and welcomed Jiang Chen in, “Sure enough, after more than a month, I found the frequency… Honestly, I was so close to giving up.”

Dr. Amos walked up to the computer, tapped a few times on the touchpad, opened the holographic screen, and showed a PowerPoint presentation ito Jiang Chen.

“This is?” Jiang Chen asked with a slight frown.

“Another piece of memory, but what I found is somewhat different from the one you encountered.” Amos shrugged. “It’s very short. If you saw is a history of that world, then this is just a diary. Or memoir. After reading it, I made a slide show based off of my memory.”

“A diary?” Jiang Chen looked at the image on the holographic screen and asked, “Whose diary?”

“The last Gaia,” after a pause, Amos continued, “The one who died in that ruin.”