Buzz, buzz.
In the middle of the night, Shi Tie Zhu suddenly opened his eyes.
Darkness could not block his sight. The faint glow of the Guanlan Sky Eye lit up as Shi Tie Zhu looked toward the buzzer by his bedside.
Shi Tiexin woke up as well. "What is it?"
"There's a signal on the frequency we set." Shi Tie Zhu pressed the button and shut off the buzzer. "The radio intercepted a message and recorded it."
"There really was a signal?!" Shi Tiexin said in surprise. "Is there a Third Frontline here too?"
"Perhaps there is no Third Frontline, but encrypted frequencies do not vanish on their own. It is also possible that someone else is communicating on this frequency." Though it was the dead of night, Shi Tie Zhu did not feel sleepy in the slightest.
On one hand, he had long developed the habit of falling asleep anytime, waking up anytime, and becoming instantly alert the moment he woke. On the other hand, his cultivation had borne fruit and he had not expended much energy. So what if he did not sleep? It was no big deal.
Thirdly, he had also become somewhat vigilant.
"Strange. At a time like this, who would use this kind of near-field encrypted frequency to communicate?" Shi Tie Zhu threw on some clothes, strode through the corridor, and entered the radio room.
He sat before the machine's screen and took a look. They had indeed intercepted a short message.
It was extremely brief—so brief that it did not even contain words.
When the contents were visualized on the screen, there were only four dots arranged at varying distances and intervals. Between the tiny holes were lines, some long and some short, some broken and some continuous.
"This is a specially encrypted