Inside the factory building.
After the employee left, Guan Feng looked at him and asked, "What kind of wrenches do you have in your workshop?"
"wrench?"
Workshop Director Chen asked in surprise, "You need it?"
Guan Feng nodded and said, "I want to try opening the valve! Here's what we'll do: send over all the valves as a whole set, and I'll compare them to confirm which type of wrench it is."
Director Chen quickly replied, "Okay, okay."
A moment later.
A set of valves was delivered by two people.
Guan Feng finally identified the large valve wrench by following the marks on the valve disc.
He nodded and said, "This is it!"
When Zhao Dong and the others looked over, the marks on the valve disc did indeed match.
Zhao Dong immediately said to the workshop director, "Director Chen, please check all the wrenches in the workshop immediately, especially this large wrench. Bring over all wrenches of the same type. Also, please find out the circumstances of any missing wrenches."
Director Chen hurriedly replied, "Okay, I'll have someone bring it over right away!"
Zhao Dong nodded.
And at this time.
Guan Feng picked up the wrench and started trying it out.
He first tried the valve that hadn't been turned on. Now he had mastered the control of his own strength to an extremely high level. This level of strength was child's play for him, and he could clearly determine the specific amount of force in every part of his body.
A moment later.
He felt that the valve was loose, so he put down the wrench and replaced it with another valve.
Five minutes later.
He looked at Zhao Dong and Liu Keming and said, "Team leader, Captain Liu, the suspect should be about 1.75 meters tall, and slightly weaker than an average adult. The quantifiable data should be XX."
Zhao Dong asked in surprise, "You can tell by strength, but how did you figure out by height?"
Guan Feng explained simply: "Exerting force! A person's exertion state cannot lie, especially when going all out. Captain, look, these marks here and here were left by the other side, and these are mine. By comparing the angles, we can deduce the approximate height at which the other side held the valve disc."
Zhao Dong nodded approvingly and said, "Good job, Xiao Guan. I don't think even the technical department can match your level."
Liu Keming laughed and said, "The technical department? They mainly rely on instruments for analysis, but Xiao Guan deduced two clues with the naked eye, and the two are not the same focus!"
Guan Feng said, "Team leader, team leader, let's investigate based on this clue first. I'll take the team to retrieve the surveillance footage. Also, on the company side, Gao Dacheng will cooperate with the two leaders to see if anything has happened recently."
Zhao Dong nodded and said, "Okay! We'll do it your way!"
Guan Feng summoned Gao Dacheng and others, informing them of the current situation. He also instructed them to split into two groups: one to follow Liu Keming and closely investigate the factory's situation, especially recent personnel matters. There is no love without a reason, nor is there hatred without a reason. If the other party has opened the valve, there are likely only a few possibilities.
Guan Feng then led Liu Shengguo, Qi Xia, Huang Lili, and others to the monitoring center.
He uncovered the clues about the people involved!
He also had a good grasp of the difference in height and strength.
He is undoubtedly more authoritative in terms of surveillance.
The group split into two groups.
Guan Feng led Liu Shengguo and others to the monitoring room.
Upon seeing the group, the security guard immediately made way and asked, "Hello! Do you need our cooperation in doing something?"
Guan Feng nodded and said, "That's right! I need your cooperation in investigating the surveillance footage. I need you to retrieve all the surveillance footage near the factory where the chemical gas leak occurred today!"
"OK."
The security guards retrieved all the relevant surveillance footage.
Guan Feng took a look and found that the four surveillance cameras on the perimeter of the factory were all pointing at the roads within the factory area.
He frowned and asked, "I saw there's another surveillance camera in the factory, why isn't it showing anything here?"
The security guard said, "You mean that security camera? It's broken!"
Guan Feng asked, "It's broken? When did it break?"
The security guard said, "It's been broken for over a month. We reported it to our superiors, but the equipment department said we have to wait until the quarterly deadline for unified repair and replacement."
Guan Feng frowned and asked, "Was it like this before?"
The security guard said, "Yes, they are all quarterly repairs. For such a big company, it's a complicated process to report to the equipment department for inspection, to the finance department for approval, and then to replace and repair them all at once."
Guan Feng noted down this suspicious point and prepared to have someone check the records. If it was true, then there wouldn't be a big problem! If it wasn't a quarterly repair, then the possibility of deliberate sabotage was very high.
He said, "Okay! We need to check the surveillance footage. If there's nothing else, you can leave now."
The security guards quickly retreated.
Guan Feng entered the room and, according to the schedule of the patrol inspection, determined the relevant retrieval dates.
According to the patrolman, he discovered the valve was open at 6:00 a.m., and the patrol inspections are conducted in six-hour shifts, meaning the valve is closed around 12:00 p.m.
He entered the time point 12 o'clock.
The relevant footage popped up, and according to the human shadow monitoring and recognition function, no one was found in the entire factory area except for vehicles and a few people.
After the others finished reading, they frowned and said, "There's not a single person here?"
Just then.
A patrol officer appeared on the surveillance footage.
Guan Feng looked at the time; it was 5:55 a.m.
He said, "Apart from this patrolman, no one else was found to have entered or exited the factory. Of course, this surveillance system has blind spots. If someone is familiar enough with the factory area, they can bypass these surveillance cameras to enter and exit."
Everyone nodded in agreement.
Guan Feng thought for a moment and said to Qi Xia, "Qi Xia, go to the factory and check the area covered by these four cameras again. Find out what routes the other party might take to avoid these cameras, and check along those routes."
Qi Xia immediately nodded and walked over.
Guan Feng then looked at Liu Shengguo and continued, "Let's move the timeline back to 6 p.m. last night and see if anyone entered or left this factory between 6 p.m. and midnight."
There was a previous case where inadequate patrol inspections led to errors in their judgment of the case's timeline, and Guan Feng did not want a similar situation to occur again.
Liu Shengguo then retrieved the relevant records as instructed by Guan Feng.
A moment later.
The relevant footage was retrieved.
This time, apart from the patrol inspectors, no one else was seen walking by.
Guan Feng frowned.
In fact, given the speed of the gas leak at the time, it must have happened in the early morning; otherwise, the incident wouldn't have been resolved so quickly.
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