Perhaps for the technology side, in order to achieve optical invisibility, the pre-technology that needs to be pointed is really not a small number, unless that civilization happens to find some Precursor civilization relics, or happens to have some civilization-level adventures such as special resources......

However, for the mysterious side, optical invisibility is a sparse and ordinary thing. Pen ~ Fun ~ Pavilion www.biquge.info In the most ordinary magic sequence, you can also see the figure of invisibility.

Therefore, in this world where there are basically no restrictions, Xuefeng and the others not only built an underground armed fortress, but also combined the technology side and the mysterious side of the technology, and really began to combine.

The previous bipedal walkers, quadruped chariots, knight apprentices, and other mechs, as well as the Armed Fortress itself, are all test subjects for the combination of the two.

Now because of the invisible circle, the Nighthawk, which is invisible on the optical level, is naturally one of them.

Of course, as the work of Xue Feng and others, Nighthawk not only achieved optical invisibility, but also used various materials and magic arrays to create this body, almost completing the stealth standards in infrared invisibility, radar invisibility, electronic invisibility and so on. It can be said that, in addition to detection methods such as space and presence, the Nighthawk has achieved absolute invisibility.

Xue Feng and the others are still unable to let the drone enter another dimension by itself, and still ensure the observation of the outside world, so there is no way to make the Nighthawk disappear from the concept of space. But even if it can't infiltrate another dimension, Nighthawk has reached the pinnacle of hiding its body in a conventional reconnaissance aircraft.

Even in order to eliminate the side effects caused by high-speed movement after invisibility, Nighthawk will turn off all thrusters after entering the invisible state, leaving only the jet port of the emergency forced avoidance system, and pushing Nighthawk to move with what can be said to be a negligible air current.

With the gravity control device running, the Nighthawk can float in mid-air, even without any external power. In addition, the gravity control device is located inside the body and is wrapped in thick special armor, so all fluctuations caused by the device will be blocked and absorbed when the device is running, and there is absolutely no possibility of detection.

Although the Nighthawk's movement speed is reduced to an outrageous level, in exchange, when the Nighthawk moves, it only brings a small amount of wind with it, and it may even be smaller than the wind in nature.

As for what to do if the wind is too strong in nature, at that time, Nighthawk will naturally turn on its own sub-thrusters according to the situation on the scene, such as using magic arrays on the technology side and technology devices on the mysterious side, and the focus of attention between the two has never been equal, so there is no need to worry about the enemy discovering the existence of Nighthawk from the "exhaust" emitted by the thrusters.

In fact, there is no need to worry too much about this, unless the environment is extremely strange and harsh, at ultra-low altitudes, no matter how fast the wind speed is, it is impossible to reach the point of blowing a reconnaissance plane away at will. Because of the Nighthawk's levitation ability and low-speed movement, the combat height of the Nighthawk is generally about 100 meters.

That's right, the official name of the Nighthawk, which has done this in order to hide its figure, should be: ultra-low-altitude and low-speed stealth reconnaissance aircraft in enemy-occupied areas!

This is a stealth reconnaissance plane specially developed for the purpose of conducting reconnaissance in the most dangerous enemy-occupied areas!

At this time, the invisible Nighthawk, like an assassin who does not exist, quietly entered the target location: the dark forest.

Just as Chrissy had inferred from the information sent before the platform that had left the Dark Forest and continued eastward. A hundred meters above the dark forest was covered with a thin layer of "sin", and there was no obstacle inside except for the insignificant aura of "sin" that escaped from those monsters of "sin". The only problem is the same old problem, that is, as the densest primeval forest in the east, the Dark Forest hides almost everything under the treetops without a single loophole, so that the most intuitive optical detection has no effect.

Therefore, for the detection of the internal environment of the dark forest, the nighthawk has to use other detection methods.

Kiriko, Rifa, Yukikaze, and Chrissy, who were in the armed fortress below Kawagoe City, were watching intently at the information sent from Nighthawk. Xue Feng, who was on the main seat, switched more than a dozen display screens back and forth for half a minute, sighed helplessly, and said to the others in such a tone: "Although it was expected, it seems that there are probably no living creatures in the dark forest now. ”

Except for the "sin" detection circle, all the images sent back by the detection system are as calm as a pool of stagnant water. This is very similar to the situation that happened when Chrissy and Kiriko checked Baihui's location, and several people naturally knew what this meant.

However, for the current situation, several people have long been mentally prepared. After knowing what the vanguard army of the "sin" monsters did when they were marching all the way, it was naturally impossible for a few people to have any expectations for the existence of life in the lair of these monsters.

Trees, you say? Can those trees that have been entangled in the breath of "sin" really be ordinary beings now, and not some kind of monster of the same kind?

Of course, there are still discoveries, and on the "sin" detection array carried by the nighthawk, it can be clearly seen that some monsters with the breath of "sin" are converging towards the edge of the forest, and they seem to want to become a big ~ wave and then set off, so after leaving the forest, these monsters did not immediately set off for Kawagoe City.

This means that everyone still has a lot of time to prepare, and it also means that the next time Xue Feng and the others are really going to play in person. With the remaining forces in the fortress now, it will definitely not be able to stop the next wave of monsters' attacks.

However, there is only one valuable discovery. In this state of calm to the point of stagnancy, the various detection systems carried by Nighthawk are really useless.

"It seems that conventional detection methods have lost any superfluous information." Chrissy calmly analyzed the current situation, "Do you want to use that?" ”

"Isn't that a matter of course, but let's take it as a test this time." After Xue Feng replied, he ordered Nighthawk with a wry smile, "Activate the No. 2 Forced Detection Plan!" ”

As the most elite reconnaissance aircraft of the current Overwatch Dragon, which was developed by gathering the countless energy of Xue Feng and others, it is naturally impossible for Nighthawk to only have the function of stealth.

After Yukikaze's order was given, Nighthawk's belly position quickly opened a hole, and after throwing something, it quickly closed again, taking no more than three seconds in total. The effect of the opening, which destroys the invisible effect, is minimized.

At the same time, Nighthawk also changed direction, turning the jet port's jet efficiency to the maximum, and increasing its own speed to the maximum without affecting the stealth effect.

The small cylindrical object that was thrown also fell some distance in mid-air and began to adjust its shape. The next moment, this little thing completed the adjustment of its posture, and then floated in the air like a nighthawk.

Unlike the previous Nighthawks, this little thing does not have any stealth performance, including radar, and its existence can be clearly detected. Of course, because the length of this little thing is only 20 centimeters, and the diameter is only about 5 centimeters, whether the large radar will filter it as clutter is only known to Tianhe radar.

As for why this little thing doesn't need any stealth performance, it is naturally because this is a one-time consumable specially developed for forcible detection!

As a consumable that was developed without considering long-term reuse and alarming enemies, what stealth effect does this little thing need?

Since there is no need to think about stealth performance, and there is no need to think about other things, this little thing can float in the air, naturally because of the limited-time gravity circle engraved inside. Gravity control equipment? The volume of this big guy is even far more than the total volume of this little thing!

So, just after Nighthawk came to a safe place at least three hundred meters away from this little thing. This little thing, which had been floating for a while, and was almost unable to float according to the preset, emitted an extremely strong wave of fluctuations.

Not to mention those who feel sensitive, even people in modern society can detect this fluctuation, because this fluctuation is so strong that it can cause the human body to feel numb as if wrapped in static electricity!

And after this wave erupted, the little thing seemed to have completed its mission, falling straight from the sky and bursting into a bright spark. Before it could hit the ground, it had already turned into a black mass of metal slag. It was clear that the little thing had completely lost all usefulness, including various examinations of its body.

Of course, this was not an enemy attack, but the result of self-destruction according to a predetermined plan.

Just as as a consumable, the stealth performance was not considered from the beginning, and the manufacturing material of this little thing has never been selected as a good thing, and it is the simplest leftover. Therefore, after the outbreak of the extremely wide range and extremely intense fluctuations, it is naturally impossible to remain unharmed.

Choosing materials that only meet the most basic needs is not only to save money, but also to be able to self-destruct. After all, sometimes, the corpse speaks far more truth~ than when it was alive.

No matter what kind of occasion this fluctuation is, as long as there is a life that can move at will, it will naturally make all kinds of actions because of this, looking for the source of the message, instinctively dodging, and running in a panic...... In short, within the coverage of this fluctuation, unless there is really no life that can move at will, there will inevitably be some moves.

And this has achieved the predetermined goal of forcible reconnaissance, even if the other party is in his lair, he is almost immobile, only there are fluctuations, plus the Nighthawk who has been staying on the sidelines to watch everything, no matter how sophisticated the enemy is, he will inevitably show some horses.

Of course, for specialized sleeper troops, this scheme is naturally useless. It's just that the Nighthawk is operating in enemy-occupied areas, and that enemy will arrange all of them in his own home~ elite lurking troops?

No matter how elite the sleeper troops are, they will subconsciously relax their spirits in their own homes, and suddenly encounter this kind of forcible detection, and their actions are likely to be not much better than others.

However, not only because this kind of forcible reconnaissance can only be used once, but also because the use of this method basically shows how difficult and difficult the Nighthawk is to fight, and does nothing, so this fluctuation is not just a shock to the enemy.

This fluctuation is also a detection fluctuation of the same nature as radar waves, which can be felt by the sluggish human body, which can show how strong the penetration of this fluctuation is. So, naturally, this wave can detect something that is hidden.

Naturally, the one who receives the information transmitted back by this fluctuation is not the little thing of the sender. This small cylinder, which is only 20 centimeters high and 5 centimeters wide, is already overloaded when it is stuffed with this wave generator, and the receiver or something is completely a joke. Besides, this little thing has already self-destructed after sending this fluctuation, and it is naturally impossible to receive any fluctuation.

So, it was the Nighthawk who was also on the side who received this fluctuation. Because it's just acceptance, there's no chance of being discovered.

This is the No. 2 forcible investigation plan pre-set by Xue Feng and others, and with No. 2, there is naturally No. 1. The second is a combination of scaring and blatant attack, while the first is an internal infiltration. With a combination of a small ground reconnaissance vehicle and a miniature spy mosquito fly, it is possible to conduct reconnaissance inside houses and underground bunkers. It's just that because this is a plan that will definitely be discovered, it is also divided into the scope of forcible investigation.

It is said that it is a low-altitude and low-speed reconnaissance aircraft in enemy-occupied areas, and the Nighthawk is not as delicate and frail as you think, small ~ clever ~ delicate ~ long. You know, the various detection systems installed on Nighthawk's body occupy a lot of space.

That's right, the size of the Nighthawk is quite large, after all, in addition to it, even the prototype of the Nighthawk, the DI-1 reconnaissance aircraft: Sharp Eye Eagle, and the DC-1 fighter: Raven, all the bodies used are DP-1 six-engine large armed transport aircraft: Dapeng Bird.

Therefore, as a truly large air unit, the Nighthawk still has enough belly capacity to load various auxiliary units that can operate independently after accommodating various necessary equipment, stealth devices, and reconnaissance systems.

This also provides sufficient support for Nighthawk to carry out various reconnaissance missions alone in enemy-occupied areas or in dangerous environments.

Without further ado, after receiving all the news from this fluctuation and processing it a little, Nighthawk passed it through the ground communication base station that had been pre-set up earlier, and after waiting for a while, the ground base station relayed it back to the armed fortress.

Ground base stations are also part of Nighthawk's hidden form. With the low-speed advance of the Nighthawk, at intervals of an indefinite distance, the Nighthawk will throw a ground base station that is not small, can be self-invisible, and has a certain information processing capability in a hidden and safe location.

At the same time, Nighthawk does not communicate directly with the base, but will randomly relay information to several undetected ground base stations. Then, after the ground base station confirms that there is no blocking, after waiting for an indefinite amount of time, the intelligence is secretly transmitted to the base. Eventually, the ground base station will self-empty the data, so that even if the enemy finds and captures the base station, they will not know what intelligence has been leaked.

While there is still a risk of detection, this has minimized the possibility of intelligence leakage and interception.

However, at this time, this preset plan to ensure secrecy has become the only way for Nighthawk and the fortress to communicate. With the "sin" in the way, even if the Nighthawk wanted to connect to the fortress directly, or through the working platform, it would be almost impossible.

When Xuefeng and the others received the information obtained by this forcible investigation, even Xuefeng and Chrissy showed a slight surprise, and Kiriko and Lifa even shouted:

"What the hell is this?"

ps: Sorry, there is something today, so there is only one change. (To be continued.) )