The system is the king of the counterattack master

Han Xiaodong moved his body, poked his head out to look at the top of the wind tunnel, it seemed to be [-] to [-] meters high from the upper floor, and there was no place to grab on the wind tunnel. If he wanted to climb up, he had to use tools.

From this point of view, the only choice for those thieves is to hang down the rope directly from the top, then rappel down into the ventilation duct on the basement floor, and return the same way after completing the theft.

If so, there should be marks on it.

The main air intake is on the first floor, and the other floors are sealed up and down, and there is no exit to the outside, so the only way out for the thieves is the first floor. As long as they climb to the top, they will not worry about finding evidence.

Thinking of this, Han Xiaodong reached out and touched the side of the wind tunnel, and was about to take out the climbing tools from his treasure bag, when someone shouted from behind: "Did you find anything, Mr. Taylor?"

The voice sounded abruptly, and Han Xiaodong was taken aback. He was about to touch the treasure bag with one hand, and was trying to lean his body out of the main air duct with one hand. He was so frightened by the sudden sound that he almost missed his footing. fall down.

Han Xiaodong hurriedly turned his head to look, only to see Larson crawling over from behind him. His figure was fat, and he was out of breath when he climbed up.Fortunately, the ventilation channel of this branch was wide enough so that he didn't get stuck in the middle.

"What are you doing here?" Han Xiaodong asked a little dissatisfied. With this guy around, he couldn't climb up blatantly.

"Let me see if there is anything I can help." Larson crawled to his side, squeezed forward, and poked half of his head out from Han Xiaodong's side.

I looked up and down the ventilation ducts respectively, maybe I was frightened by the black hole that I couldn't see the bottom from below, so I shuddered and retreated.

"It's the first time I've come here." Larson wiped his forehead, expressing that he had just been frightened: "If they really came from this side, they would be bold enough, but , how did they get in?"

Han Xiaodong frowned, thinking that if you hadn't come, I might have known how they got in a long time ago, and if you mess up like this now, it would be completely useless.

Just as he was thinking about it, Larson said again: "This is really a big gang. Let alone whether there are ghosts in the security department. To enter the warehouse, at least two people are needed, and another person is needed. To change the monitoring signal, so many people acted without leaving any obvious traces, this group of people is really extraordinary."

Hearing what Larson said, Han Xiaodong suddenly remembered something, and quickly said to K in his heart: "Show me the monitoring circuit diagram in this building!"

After a while, an extremely complex circuit construction drawing appeared in front of Han Xiaodong.

He carefully looked at every detail on the picture, and suddenly took a breath: "Why is there such a setting?"

Because he was too surprised, he uttered this sentence, which caused Larson to ask, "What's wrong? What settings?"

Han Xiaodong quickly asked, "Is this directly connected to the third floor?"

Larson nodded quickly.

"Then what? Is it a closed circuit?" Han Xiaodong continued to ask.

It should be. This ventilation system does not use one air duct for air supply and exhaust. There are eight sets of air outlets on the bottom floor, four inlets and four rows. It was blown away, so in the opposite direction to us, there is another air outlet, so that the circulation system is connected to the same floor, and the other floors should be airtight. "

"Then what's under the third underground floor?" Han Xiaodong didn't ask any questions about this question, but asked a question that seemed strange.

"This... I don't know about this, I didn't notice it in the drawings." Larson's answer was unassuming, and it seemed that he also regretted his negligence a little bit.

"Let's go, let's look for a blueprint." After finishing speaking, Han Xiaodong waved to Larson, indicating that he could retreat.

Larson's figure is relatively fat, so it is not easy to turn around, but at least he turned around.

It took a lot of effort for the two of them to leave the air duct. Larson asked the staff to reinstall the baffle, and then took Han Xiaodong to find the construction drawings.

The entire castle group is like a complete park, with its own professional engineering department, so the drawings are easy to find.

On the drawing, Han Xiaodong pointed to a long and thin passage and asked Larson: "What is this?"

Larson looked at it for a long time, and finally shook his head to express that he didn't understand. In the end, someone from the engineering department revealed the answer: "That's the underground cable maintenance channel, all our lighting, network, and everything that uses wires , where are they all concentrated?"

"The monitoring is also there?" Han Xiaodong asked.

"Of course, four research rooms, one warehouse, and three living quarters. All the monitoring will eventually be brought together to the monitoring center of the Ministry of Security, which must be connected with cables."

After the people from the engineering department finished speaking, Han Xiaodong turned his head to Larson. At this time, Larson's eyes were as big as light bulbs. He finally understood why Han Xiaodong asked himself this question.

This underground cable channel is still under the third floor underground, and since it is a place to maintain cables, there must be room for maintenance and construction, that is to say, this is a hidden space that most people will not notice The escape route also meets the need to cut off monitoring.

"How big is the space inside?" Han Xiaodong asked, pointing to the long and narrow area.

"It's not a problem for two people to stand side by side for construction." The engineer replied: "After all, it is used for inspection and maintenance, and the space is too small to display it."

As expected, this is the best route.

"When was the last overhaul?" Han Xiaodong asked.

"About a year ago? Routine inspection. No one would go there easily. Cables don't fail often." The engineer answered very naturally.

"That's right, the underground is so boring, no one wants to go down." Han Xiaodong asked his own question deliberately and euphemistically.

"Hahahaha, don't worry about that. Don't look at the narrowness inside. The building's ventilation system is directly connected to it, so it's not very stuffy." The engineer was unsuspecting, and what he said was exactly the answer Han Xiaodong wanted.

"Where is the exit of the passage?!" It was Larson's turn to be anxious this time. He had already understood what Han Xiaodong meant by asking these questions.

Seeing that Larson was very excited, the engineer replied blankly: "There is a side door on the third basement floor of the warehouse, you can go in directly."

"What about the location where the cable connects to the outside world?" Larson continued to ask with staring eyes.

"This..." The engineer suddenly got stuck.

He thought for a while, picked up the blueprint and looked at it for a long time, finally took out another blueprint and compared it for a long time, then murmured:
"There is no such location as you mentioned. We directly introduce public cables from the outside world. There is only one entrance to the cable channel, which is on the third floor underground."

Larson was a little disappointed when he heard this answer, but at the same time he seemed a little relieved, but the engineer immediately said:
"However, from the map, the monitoring transmission cable is not routed in this way. There is indeed an exit at the other end, but that exit should be very safe."

When Larson heard that there was another exit, he immediately became nervous again, and hurriedly asked, "Where is it?"

"Security Department." The engineer spread his hands and replied.