Countdown, twenty-five seconds!
Neltharion took pictures of the forbidden military zone from every angle, including the fixed routes of the two patrol teams, and sent them to Li Yao's brain for modeling.
Li Yao's main concern was what to do if the patrol team changed their route halfway.
According to Jin Xinyue, in the standard code of the Coalition Army of Demons, every patrol team would set up three to four different routes, which would change every half an hour or an hour.
If Li Yao and the Fire Ant had more time to observe, they would be able to see the pattern of the change of the patrol routes.
But they only had several minutes to prepare. They could only try their luck.
If the patrol team did change their route, Li Yao would have to be prepared.
Based on the terrain of the forbidden military zone, he calculated twenty-three possible changes that the patrol team might make. He was certain that he had seven seconds at the very least.
Countdown, fifteen seconds!
The Fire Ant took out a delicate cylinder carved with demonic stripes from his pocket and opened it softly. Two black beetles with a green vertical stripe on their back flew out of the cylinder.
Under the control of the Fire Ant, the two beetles flew higher and higher. Passing the high wall outside of the forbidden military zone, they reached the entrance of the No. 2 ventilation tube in advance.
Countdown, five seconds!
Li Yao took off the clothes of a treasure merchant and put on a new membrane suit.
The suit was as thin as a cicada's wing. It stuck to his body like a second layer of skin without the slightest gap. Every muscle was clearly visible.
"Shua!"
Li Yao touched a rune on the waist of the suit. Ripples spread out on the surface of the light gray suit and gradually turned translucent. In the end, it seemed to have melted into the air. He was completely invisible!
It was a cellular stealth suit that the specialists of the Blade of Chaos had created by extracting the cells of demon beasts that boasted the abilities of camouflage, mimicry, and transparency.
When it was still, it was barely noticeable, like an ice cube that had been thrown into water.
The only flaw was the composition of the Cell Stealth Suit. All of them were highly active and needed to be stored in a special culture solution. Once taken out and exposed to the air, their lifespan would not exceed five minutes.
Basically, after four and a half minutes, the Invisibility Cloak gradually lost its effectiveness.
On the other hand, the Invisibility Cloak was most effective when it was stationary. They would still leave behind afterimages, causing strange distortions in the air.
Countdown: 0 seconds!
Li Yao drifted out like a wisp of smoke.
"Shua!"
He keenly sensed the net of heat rays on the high wall of the military forbidden zone. Then, he shrank his bones and muscles to the minimum and crawled in through the gaps of the net of heat!
The two patrol teams were moving in the opposite direction of the No. 2 ventilation duct. Li Yao calculated the time they would return. At the same time, he observed the scanning angles of a few biochemical surveillance eyes high up in the sky. He moved around in the blind spots that were as big as the tip of a needle. He quickly approached the target.
Right at this moment —
One of the patrol teams turned back in advance before reaching the end of the restricted military zone and changed to a new patrol route!
"Damn it!"
It was indeed the second patrol plan!
Li Yao instantly stopped moving. His heartbeat and breathing were suppressed to the minimum. Even his pores were completely locked. He did not release the slightest heat or breath and simply watched the patrol team coming at him.
As long as he was absolutely still, the Invisibility Cloak would work. The invisibility period was five minutes. That was enough!
The patrol team passed by Li Yao. The soldier closest to him could touch Li Yao's head as long as he stretched himself.
Thankfully, they did not notice the slight distortion in the air right next to them.
Even half a minute after they passed by, Li Yao was still motionless. Relying on Neltharion, he observed their new patrol route.
After changing to the second patrol route, the blind spots between the two patrol teams were completely different from before. Everything had to be calculated again.
After calculating in silence for one minute and two seconds, Li Yao was activated again!
In the depths of his brain, the biochemical surveillance eyes on the top of his head and the twenty to thirty eyes of the two patrol teams seemed to be shooting out crimson rays that seemed to be solid, forming a crisscrossing dead line in front of him.
The lines of death were changing nonstop, and he was dancing with them, sometimes fast and sometimes slow, sometimes forward and sometimes backward. It took him more than three minutes to move to the entrance of the No. 2 ventilation tube.
At this moment, there was only one minute left before the invisibility cloak lost its effect.
In order to deliver air to the main body of the Eye of Blood Demon, every ventilation tube was about one foot in diameter. An adult of medium size would be able to squeeze into it.
However, the entrance of the ventilation tube was covered in a very dense iron net, which was surrounded by anti-cutting alarm rune arrays.
Li Yao glanced at it quickly and figured out the mechanism of the alarm rune arrays. They should be sending out alarms by sensing the vibrations.
Once an external force broke the iron net by force, abnormal vibrations would certainly be transmitted. As long as it was sensed, the alarm would be sent out.
Shua! Shua! Shua!
Inside the iron net, half a meter deep into the tube, three enormous blades were revolving at a speed of 1,500 revolutions per minute. Aggressive rune arrays of the wind class had been carved on the blades, which raised unstoppable wind blades and turned the section of the tube into an invisible meat grinder.
There were forty-five seconds left before the invisibility cloak completely lost its effect.
Zi! Zi! Zi!
Li Yao sensed that the invisibility cloak was gradually becoming rigid and sluggish.
It was a sign that the invisible cells were about to wither.
At this moment, the two patrol teams were as far away from him as they could be. All the biochemical surveillance eyes happened to be scanning other areas, too.
However, after the adjustment of the route, Li Yao only had eleven seconds left!
"That's enough!"
Li Yao's hands immediately turned into two clusters of gray fog. First, he attached four pieces of magical equipment that looked like magnets to the alarm rune arrays softly. The four pieces of magical equipment formed a temporary circuit, which meant that the alarm rune arrays had been temporarily led into a 'fork' so that they could ignore the tiny vibrations on the iron net.
Then, Li Yao scraped a lot of rust from the iron net carefully with a sharp bone blade and stored the rust properly.
It took Li Yao three seconds to finish everything.
Then, he drew a circle on the barbed wire and cut it open silently. Then, he crawled in!
It was not difficult to cut the iron net. What was difficult was to restore it to its original state!
The patrol team furthest away from the forbidden military zone began to turn around. The two biochemical surveillance eyes gradually turned back and locked onto the entrance of the No. 2 ventilation tube, too.
Li Yao's fingers were like ten boneless snakes. Between two of his fingers was a needle the size of a cow's hair.
The needles, on the other hand, were hollow. Behind them was a tiny capsule that stored a tiny amount of natural glue, which was used to fix the components of the super-tiny magical equipment.
Manipulating the tiny muscle bundles on his fingers, Li Yao squeezed out the glue with a fine needle and glued the short opening of the barbed wire back together. He purposely spilled some glue at the edge of the barbed wire and blew the rust that had just been scraped off onto the barbed wire.
In the end, he took out a can of spray and sprayed the iron net softly.
Immediately, a thin layer of dust appeared on the surface of the 'rusty' iron net. There were even broken threads that looked like the remnants of a spider web.
At first glance, it was flawless. There was no sign that it had been broken by brute force at all.
It was not until then that Li Yao hooked the four 'magnets' into the holes on the iron net with his spiritual energy, restoring the alarm rune arrays to the normal circuit.
"Shua!"
The biochemical eyes glanced at the entrance of the No. 2 ventilation tube and did not detect any anomaly.
However, the invisibility cloak on Li Yao's body had reached the limit of its longevity. Twisted light spots were appearing on it.
Once the patrol team drew close, they would certainly discover the fuzzy gray shadow behind the iron net.
The two black beetles of the Fire Ant, on the other hand, crawled in together with Li Yao and crashed into the high-speed fan!
The fan was spinning fast and had a strong attraction force. It often sucked in some tiny flying insects.
The two black beetles, on the other hand, were the 'Green Oil Fire Bugs' that the Fire Ant had carefully refined. After they crashed into the fan blades brutally, they immediately burst out two tiny fireballs!
The two fireballs interfered with the rune arrays of the wind class on the fan blades. The self-protection mechanism of the fan was activated. There was a temporary slowdown in the speed of the fan as it began to eliminate the tiny foreign objects.
Li Yao took the opportunity to widen his eyes. His pupils were shivering nonstop as he observed every detail of the rotation of the fan. He also sensed the wind blades that were invisible to the naked eye.
"Shua!"
He successfully crawled in through the gap of the fan blades, which were spinning at 780 rpm!
Three wind blades cut his body brutally, but he locked all the muscles on his body and did not bleed at all.
Half a second later, the speed of the fan was restored to 1,500 rpm. The patrol team happened to reach the entrance of the No. 2 ventilation tube at the same time.
Attracted by the explosion of the Green Oil Fire Bugs, they looked inside through the iron net suspiciously.
The fan was running very stably. They saw nothing except for the rapidly spinning fan blades.
The vague smell of burning in the air, however, made them realize that a few more bugs had been sucked in by the fan.
The rust, dust, and even spider threads on the iron net dispelled their insignificant suspicions. The patrol team returned to their regular patrol route and completely forgot about the trivial matter.
Behind the fan, Li Yao wiped the cold sweat on his forehead and grinned.
Half of the infiltration from the fourth alert area to the third alert area had succeeded!
In front of him was a dark ventilation tube that led to the underground. All kinds of deadly venomous insects were inside as an alarm system.
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