Kathu was running fast in what should be the right passage—

Although he was running, Kathu also probed the surrounding walls and ground from time to time, and found that the ground in these passages was also corroded, even at the top. Kathu didn't have time to think about it, and continued to run, and even though he had run a long distance in the empty underground, he could hear the sound of the green liquid rolling in the ditch - he could hear the green liquid churning, rolling, corroding and digesting......

As he ran, there was a very solid door in front of him blocking the way. Kathu was forced to stop, put his ear on the door, and knocked on the door with his finger a few times, judging from the sound it made, this was not an ordinary iron door, but a multi-material composite door,

"In that case, it seems that its solidity can't be done with a few rough kicks." Kathu stared at the door, fumbling for the lock, as there was no locking device on this particular door.

Katu still tried to kick a few times first, and the special door really didn't move, but it also proved that there must be a lock to get stuck so tightly, otherwise it would be a gate like a mechanism, moving up and down.

Kathu quickly looked at the door from the bottom up, and there was a special threshold as high as a calf at the bottom of the door, so it was impossible for the door to open in a direction that could not move up and down. Kathu took a closer look at the surface of the special door, although it was relatively smooth compared to the surrounding walls and floor. But there are also signs of corrosion on it, and it seems that those terrible green liquids will eventually invade here, and if you don't pass through this door, it will still be dangerous.

As a locksmith, although there is no audience at this time, Katu also has to solve the door in front of him in style, otherwise he will not even have the opportunity to meet the audience in the future!

Kathu closed his eyes, put his hands on the door, and slid slowly, gently, with the palm of his hand to feel the place where there might be a gap in the door, and such a gap must have been treated, otherwise those corrosive green liquids would seep in!

When Katu touched the left side of the door, there was a very small gap caught by Katu's palm, Katu opened his eyes suddenly, and his face was attached to this gap and looked at it carefully, it was indeed an extremely small one, and it was sealed with a special colloid, although the color was similar to this special door, but the feel to the touch was completely different.

Kathu looked at the door in front of him and sneered, thinking that it was just a piece of cake.

Kathu took out the pen again, removed the cutter probe at the front of the pen, and then opened the metal end cap at the end of the pen, took out the spring in it, and straightened it.

In front of this seemingly impregnable special door, Catou used the knife probe with one hand to warp the glue in the gap, and with the other hand slowly pounded it in with a straightened spring, because Catou guessed that the switch must be in it. Several times the straightened spring didn't hit the switch button.

Kathu's palm paused, his shoulders were too high, and he wiped his eyes with his arm, because the irritation of the green liquid on the other side of the ditch just now was so strong that his eyes were still shivering.

There was a "snap", as if the button had been pushed up, and the door in front of me was opened. With a hard kick, the door was kicked open, and he stepped over the threshold, turning around to say goodbye to the damn green liquid, only to find that it had spilled not far from the threshold.

"Damn, why is this thing so ferocious!" Kathu said anxiously, stepping in the other foot that had not yet crossed the threshold. Kathu tried to close the gate to stop the green liquid from advancing.

Who knew that it was easy to open the door and difficult to close, and with Katu's violent kick just now, this special door could no longer be closed intact.

"Who are you!? How did you end up here!? Behind Kathu came a stern question.

Kathu looked back and saw two staff members in blue uniforms, still carrying toolboxes instead of weapons. They must have come to inspect the door.

"The door can't be closed, and the green liquid is about to pour in." Kathu pretended to be nervous, staring at the toolbox in their hands, and deduced that they were not security guards.

I saw that the faces of the two staff members in blue uniforms changed greatly, and they didn't care about asking Katu anything more, so they hurriedly rushed to the door, and looked out, and the bubbling green liquid had already spread to the vicinity of the threshold.

"Quick! Fix the door! One of them shouted, opened the toolbox, and pulled out a special tool.

Another maintenance staff is also very skillful and cooperative, using these special tools, to quickly repair this door.

Kathu didn't leave, but was particularly interested in the toolboxes of the two staff, as he had never seen them in all the years he had explored the doorway for unlocking.

After a period of beating, sewing, and welding, the door that could not be closed had returned to its original function and was closed intact.

At this time, the green liquid outside can be heard hitting the door......

The two maintenance personnel breathed a sigh of relief, looked at each other, and wiped a cold sweat. It can be seen that if this green liquid pours in, the consequences will be unimaginable for them.

Kathu walked up to them as if he was involved in the repair, and took their toolbox with a smile.

The two maintenance personnel suddenly reacted that Katu was an outsider! One grabbed a screwdriver, the other grabbed a utility cutter, and Kathu punched them and knocked them unconscious.

Kathu opened this special toolbox and admired the treasure inside, and Kathu grabbed a spray can like spray paint, which the guy used just now for high-temperature jet welding!

Catou took out a screwdriver full of small buttons, pressed a button at random, and the screwdriver automatically switched shapes and turned into a knife; After another switch, it became an iron ruler with a scale. These special tools make Kathu happy, although I don't know what kind of technology they made it, but these tools can make Kathu's unlocking speed to the next level!

When Kathu was excitedly fumbling with the functions of these tools one by one, he only heard a "swish" sound from the door that had been closed behind him.

Catou turned his head and saw the gap that he had just warped, because the maintenance personnel did not notice this detail and did not repair it, so the green liquid was squeezing out of this gap, and the door was also steaming, it seemed that the mechanism was short-circuited!

"Hey! It's trouble again! It looks like it's going to be flooded soon. Kathu shrugged his shoulders and looked at the two maintenance personnel who had fainted on the ground, frowning.

Then Kathu carried the two maintenance personnel on his shoulders, one left and one right, and hurriedly continued to run forward......