The two magnetic poles manufactured by humans were located in the Northern Base and the Underground City Base. Both of them maintained a weak magnetic field covering the world and were inseparable. If one of them had a problem then the other would lose its effect.

There was no need for extra communication between them. The aurora appearing in the sky at night told the other that they were still there and still safe. Now the aurora was gone.

At this time, the person debugging the equipment said, “Reporting. The artificial magnetic field has disappeared and the ionosphere is disturbed. Short-wave communication isn’t feasible.”

The lieutenant general frowned and spoke after three seconds of silence. “At all costs, turn on the long-wave communication.”

“Yes!”

In the era when humans lost satellites and ground relay stations, long-distance communication became very difficult. Only short-wave radio waves could penetrate through the ionosphere into the atmosphere. However, the artificial magnetic field was weaker than the original and communication was very unstable. Now that the magnetic field completely disappeared, the ionosphere was disordered and communication became even more difficult.

Long-wave communication was different. It was ground to ground, using the earth and sea as a medium. It was stable and reliable, but the start-up costs were high. Only the oldest code could be used to transmit messages. At the same time, it was one-way. This meant that if the other party couldn’t turn on long-wave communication, they wouldn’t be able to communicate.

The message was passed down layer by layer. Finally, the communication centre received the feedback message and the long-wave communication device was turned on. The dispatcher picked up the instrument and sent codes of different intervals and lengths. This was inputted into the system in turn and uploaded to the communication channel.”

“The Northern Base is calling the Underground Base, please answer when you hear it.”

There was a long silence.

“The Underground Base is the most well-built of the four human bases. It is difficult to imagine that it will encounter a disaster.” An officer said, “I hope it is just equipment failure.”

He had just spoken when there was a shrill noise from the receiver! It was a rustling, stabbing, chaotic sound that seemed to come from the infinite universe, like the breath of a dying giant monster. Everyone in the room held their breaths until 20 seconds passed.

“Beep.”

“Beep beep.”

“Be, beep—”

The telegram finished and the dispatcher’s body trembled as he quickly recorded it.

Five minutes later, the lieutenant general asked, “What did they say?”

The dispatcher was pale and his lips were trembling. He read the paper where the signals were located and spoke. “They said that… the Underground City Base… encountered a heterogeneous invasion. The losses are heavy. They are… resisting and repairing the magnetic pole.”