The spaceships and probes owned by the Ghost Secret Service are, in some technologies, comparable to those of the Vine Forest Empire.

In particular, the navigation technology, concealment technology, and detection technology that were forced out before were basically the same as those high-level four-dimensional civilizations.

This gave Lu Yaohua room to operate.

Dai Beihe, who acted quickly, took the newly formed investigation team, controlled the spacecraft and probes, and secretly tracked the whereabouts of the Fujilin fleet.

In the work room of the investigation team.

A ghost agent, calmly maneuvering the ship and the probe.

In the middle of the studio, there was a virtual map of the vicinity, the location of the vine forest fleet, flashing red dots of light on the map, and in front of the dots of light was a straight red virtual ray.

Since the other side did not change the course, the direction of progress was very intuitive.

Coupled with the passive sirens full of ghosts nearby, the whereabouts of the Fujilin fleet have been stared at by the Dai Beihe investigation team.

The blue virtual map, the red wisteria fleet tracks, the busy ghost agents, and the Dai Bei River in the main control console have a full view of all this.

"The other party is too fast." He muttered to himself.

The deaf and clear-sighted deputy team leader was willing, and turned sideways: "Is the team leader worried about the speed of the Fujilin fleet?"

Jian raised his eyebrows slightly, and then replied calmly: "Indeed, although our spaceship is faster than the other party, we need to track covertly, and the speed must not be too fast, nor too close to the other party. ”

Gan knew Dai Beihe's worries, and now this problem is not big, it is because the location of the vine forest fleet is in the monitoring area of the ghost.

There are passive sirens here, and even if there is no reconnaissance spacecraft to track them, it is difficult for the other party to avoid the monitoring of ghosts.

However, the range of passive sirens is not unlimited.

On the virtual map in front of you, those flashing yellow points of light are passive sirens arranged by ghosts, and there is obviously a boundary line.

According to the advancing speed of the Fujilin fleet at this time, it is estimated that it will not take 3 years for the other party to pass through the monitoring boundary line and enter the four-dimensional space-time that is very unfamiliar to the ghost.

Once the other party enters an unfamiliar area, without the assistance of passive sirens, relying solely on the tracking of reconnaissance spacecraft and probes, there may be leaks.

That's where Dai Beihe's troubles lie.

"Team leader, maybe you can arrange a batch of passive sirens in advance." Gan proposed.

"In advance?" Dai Beihe's eyes rolled, revealing a hint of clarity.

This proposal is indeed executable, because the route of the Fujibayashi fleet has a distinct feature, that is, it is moving in a straight line, and so far, there is no sign of turning.

In this way, this characteristic of the other party? Just provide some room to maneuver.

The more you think about it, the more feasible it becomes? He immediately drew 10 ghost agents from the investigation team? The relevant application was submitted to the second headquarters of the ghost.

Lu Yaohua quickly approved this matter? Let the ghost person in charge of the border line cooperate with Dai Beihe.

According to the predicted direction of the rattan flotilla, Dai Beihe commanded his subordinates? In the ghost secret base of the Borderline, a large number of probes have been created.

And then let this batch of detectors? Along the predicted route? And leave a dense number of passive sirens along the way.

In fact, Dai Beihe is gambling that the rattan forest fleet will not change its course.

With a speed of about 24% faster than the Fujilin fleet, and the fact that the two sides already have a 3-year space-time distance, the ghost's probe is one step ahead? A large number of passive sirens were arranged along the route.

The other side? The Fujilin fleet was moving at full speed, without stopping for a moment, even if it found detectors and sirens for new humans, they simply chose to ignore it.

Judging from the performance of the Fujilin fleet, Dai Beihe and the others felt more and more strange and dignified? It also piqued their curiosity.

What is hidden at the end of the red void ray?

Quiet years? After 3 years of unknowingly, the Fujilin fleet finally crossed the boundary line of the new humans? Entered a strange four-dimensional space-time.

In the tense atmosphere of the studio, the red point of light that represents the Fujilin fleet? After highlighting the boundary line? A little bit of a flickering forward? The trajectory is still in the predicted course.

Seeing this scene, Dai Beihe breathed a sigh of relief, things did not exceed their expectations, and the previous preparations were not in vain.

"Keep an eye on it, don't lose it."

"Understood."

Dai Beihe did not completely put his mind at ease, but was ready at any time, and in the past three years, he made some other arrangements.

From the first batch of forward detectors, a batch of proliferation came out, and then scattered in all directions along the way, and these scattered detectors also arranged passive sirens along the way.

On the virtual map, you can see that the yellow light point like a tower tree is the ever-expanding monitoring range.

With this proper arrangement, even if the Fujilin fleet suddenly turns, it will be difficult to avoid the surveillance of the ghosts.

The reconnaissance spacecraft, which had been hanging behind the other party, did not stop, but continued to track.

Time passed unconsciously, 19 years quietly passed.

An exclamation broke the dullness in the studio.

"Report, it was found that the Fujilin fleet had stopped sailing."

Dai Beihe's expression was serious: "The reconnaissance spacecraft behind stopped flying and stood by in place. ”

"Roger." A ghost agent who controls a recon ship and conceals it inside the timeline where it is.

Dai Beihe then asked, "Ganxin, has the forward detector found any abnormalities?"

"I haven't found any anomalies yet, do you want to make any adjustments?"

"Then pause, if the enemy doesn't move, I won't move."

All of a sudden, the reconnaissance spacecraft, probes, and sirens under the control of their investigation team all stopped, while the ghost agents in the studio carefully observed every move of the Fujilin fleet.

This rattan fleet did not let Dai Beihe wait too long, and after 17 minutes, set sail again.

"It was found that there was a shift in the route of the Fujilin fleet, and it is being reprojected."

After about two days of sailing, it was determined that the other side did not change course again, and one of the probes that had been dispersed before became the forward probe in front of the other party.

Fortunately, the new human beings have a certain speed advantage over the Fujilin Empire in terms of navigation technology, so they don't have to worry about being thrown away by the other party.

However, in the following voyages, the Fujilin fleet was not as regular as before, and often changed routes every once in a while.

For the abnormal behavior of the vine forest people, Dai Beihe also paid more and more attention to it, from these changes, it is not difficult to see the other party's problem, there must be a demon when things go wrong, this is the case.

With the advantage of speed and the advance layout, the ghost secret service stared at each other like a dogskin plaster.

Another 4 years have passed since this follow-up.

Over time, the frequency of steering of the Fujibayashi fleet became more and more intensive.

Seeing this situation, Dai Beihe felt closer to the truth.

Suddenly, the face of a ghost agent in charge of other directions changed: "Team leader, another fleet of the Vine Forest Empire has appeared. ”

"Where?"

The agent immediately imported the detection data, and another fleet of vine forests appeared on the virtual map, with a total of 12 ring-type ships.

Dai Beihe took a closer look and found that the two fleets were quickly approaching, and he knew that the secret of the vine forest people might be in this newly discovered fleet.