The next steam pipe switch is less than two minutes away.

There are two choices in front of Qi Lin now: first, it is to turn around immediately and run out of the maintenance port where it came in before the steam has not switched channels.

Second, he continued to run into the depths of the pipe, but if he still didn't find the second access port, once the steam channel was switched, Qi Lin would not have enough time to exit the heat dissipation pipe from the original way.

This is a gamble, and the bet is Qi Lin's own life.

After thinking for a little for two seconds, Qi Lin made a choice.

Not the first, not the second, but a "compromise" between the two.

The time for the steam switching pipe is three minutes, that is, 180 seconds, Qi Lin is in this position, the maintenance port where he came in is 500 meters away, this 500 meters distance, it took him about less than 70 seconds, except for the 70 seconds to turn back, Qi Lin still has 40 seconds left.

He immediately decided to run forward for another 20 seconds, and if he didn't find a second access opening within that distance, he would immediately turn around and run back, just in time to get out of the heat dissipation pipe from the first access before the hot steam engulfed him.

"19 seconds."

Qi Lin silently began to count down for himself, and at the same time, he kicked the soles of his feet and rushed forward.

Due to the condensation of large amounts of steam into water droplets, the inner walls of the heat dissipation pipes are very slippery, and the oxygen content in the air is almost negligible. It was these two factors that greatly slowed down Qi Lin's sprint, otherwise, at the level of a second-level evolutionary, with a distance of five hundred meters, he would definitely be able to run within fifty seconds if he ran on flat ground.

"14 seconds."

The heat dissipation pipe is pitch black, it is impossible to have lighting facilities in this high temperature and high pressure environment, the embedded circuit and light source inside the heat dissipation pipe are easy to cause the pressure of the inner wall of the pipe to be unbalanced and leakage accidents, even if the technician enters the heat dissipation pipe for routine maintenance, they must also carry their own light source.

Fortunately, Qi Lin's dark vision ability once again played its part.

"Nine seconds."

The heavy soles of the boots kept stepping on the inner wall of the wet pipe, and the whole pipe had been diagonally downwards before, but now it was completely horizontal.

"7 seconds, 6 seconds...... Outlet! ”

Just as Qi Lin was about to turn around, twenty meters in front of him, something similar to an access door appeared in his field of vision.

It was a round valve, and Qi Lin hurriedly ran to this valve in three steps and two steps.

The folding handle of the valve was hidden in the hidden grid, Qi Lin opened the hidden grid and pulled the handle out, at this time, he suddenly noticed that this valve was a little different from the previous access port, there were two delicate pressure gauges on the handle, and a metal inscription was used next to the pressure gauge - "Note: Please confirm that the pressure on both sides is the same before opening the valve." ”

"Consistent pressure?" Qi Lin was stunned for a moment, and looked at the numbers on the two pressure gauges, although they were not completely consistent, but the difference was almost in the negligible range.

There is no such manometer on the inside of the first access opening - after all, if the technician is in the heat dissipation pipe, the cooling system of the entire basalt shell must be in a suspended state, and since there is no steam passing through, there will be no pressure difference between the inside and outside of the pipe.

Although there was a hint of doubt, Qi Lin didn't have much time now, he immediately turned the handle of the valve counterclockwise, and with a tooth-aching friction sound, Qi Lin pushed forward hard and opened the round valve.

On the other side of the valve, there is still a pipe, but compared to the main heat dissipation pipe, the diameter of this branch pipe is much smaller, and with Qi Lin's height, he must lower his head to pass through it.

However, one thing Qi Lin noticed was that the inner wall of this pipe was dry, that is, this pipe did not pass through for a period of time, and it was likely to be a backup heat dissipation pipe!

Qi Lin immediately got into the pipe, closed the valve behind him again, and then took out a spare coat from his backpack, wrapped the sleeves of the coat around his waist, and then padded the whole coat under his buttocks.

The inclination of this pipe is very large, and the inner wall of the pipe is very smooth, as long as Qi Lin sits on the ground, he can slide directly to the bottom of the pipe like a slide.

Taking a deep breath, Qi Lin's hands were the inner walls of the pipes on both sides, and the whole person quickly slid into the depths of the pipes.

……

But Qi Lin didn't take into account a problem, the inner wall of the pipeline is too smooth, and it is completely impossible to "brake" by leaning against the inner wall of the pipe by leaning on the limbs, and it is easy to lose balance, but fortunately, all the way down, Qi Lin saw several access openings on the side of the pipeline, and he simply didn't bother to brake, so he slipped and slipped to the end, anyway, on this pipeline, it seems that there will be a maintenance port every ten meters.

Fifteen seconds later.

"Boom!!"

Qi Lin's butt slammed into the bottom of the pipe, but fortunately there was a layer of clothing under the buttocks, otherwise, I am afraid that he would really be thrown into the flowers.

Underneath was a layer of fine and strong metal mesh, through the mesh smaller than a fingernail, Qi Lin could only see that on the other side of the metal mesh, there was still an identical pipe.

Fortunately, the closest access to Qi Lin was less than a meter above the metal mesh, and Qi Lin could reach it as soon as he stretched out his hand.

Taking out a wire, Qi Lin easily pried open the access opening and drilled out of the pipe.

This is a bright computer room, a large number of equipment that Qi Lin does not know at all occupy the space on both sides of the pipe, making a "buzzing" beep, and the maintenance port of the pipeline is just connected to the corridor vacated in the middle of the equipment, leading directly to the exit at the end of the computer room.

Two men in radiation suits and tablets in their hands are standing in the hallway to inspect the equipment in the computer room.

The sound of Qi Lin drilling out of the pipe alarmed the two of them, and the two of them turned their heads one after another.

The six eyes met, and there seemed to be a momentary stagnation in the air, and in the next second, Qi Lin immediately rushed towards the two of them!

The two of them were not slow to react, the one on the left reached for the holster on his waist, and the one on the right grabbed the walkie-talkie hanging on his shoulder-

At this time, Qi Lin had already rushed in front of the two of them, flew up, kicked the person wearing the walkie-talkie to the ground, threw out a dagger in his hand, and threw it at the person who drew the gun!

This kind of nuclear radiation protective suit has several layers of metal mesh sandwich inside the rubber shell, which can also be used as a stab-proof suit, but Qi Lin's dagger is aimed at the façade of the person-

The mask of the suit was only a layer of hard resin, which was not too thick, and the dagger pierced directly through the mask and into the man's face.

"Ahh

The man immediately fell, but in the moment before he fell to the ground, the pistol in his mouth still pulled the trigger, although it did not hit Qi Lin, but a gunshot resounded throughout the entire computer room.

"Damn it!"

Qi Lin cursed secretly, and quickly twisted the necks of the two people who fell to the ground, and at the same time, the piercing alarm finally sounded in the entire Xuanwu shell.