The water tanker drove into the yard, and the driver alone used a pipe to connect the water tanker to the central pool of the yard.

The waste liquid from the tanker quickly flows into the central pool.

Soon, all the waste liquid was discharged into the central pool of the yard, and the driver got in the car to drive the water tanker out of the yard, got out of the car and relocked the door.

While the driver closed the big iron gate in the yard, Nan Zhiqiao and Zhen Zhen quickly came out of the surrounding woods, jumped into the water tanker, and hid in the gap between the front of the car and the water tank.

Zhao Dagang also came out covered in leaves, and quickly hid under the chassis of the water tanker, holding the chassis with both hands and feet, and his head was exposed between the front of the car and the water tank.

Nan Zhiqiao and Zhen Zhen frowned when they found that Zhao Dagang didn't listen to the arrangement and followed without permission.

"Go back!" Ye Zhenzhen whispered.

Zhao Dagang closed his mouth and shook his head, his eyes were firm, and he had no intention of going back.

Nan Zhiqiao looked at the man under the car, worry flashed in his heart, and he was about to take action to let Zhao Dagang get out of the car, when suddenly, the driver locked the yard gate and returned to the driver's seat.

There was no other way, Nan Zhiqiao could only make a silent gesture to Zhen Zhen and Zhao Dagang, and the three of them followed the water tanker all the way out of the hillside woods.

The mountain road was rugged and the water tanker traveled bumpy, and soon after, it arrived at the factory area in the upper reaches of the Nam Van River.

When the water tanker arrives at the door of a factory, Minami no Qiao uses a stealth camera worn on his chest to film his surroundings.

There is no sign at the entrance of the factory, like the back door of a factory.

There is a security guard on duty inside the door, and when he sees the water tanker at the door, he automatically opens the door and releases the water tanker.

The factory was very large, and the water tanker went around the factory and finally stopped in the carport in the corner of the factory.

The driver got out of the car, did not check the situation of the water tanker, just took the door at random, walked out of the carport, and closed the wooden door of the carport and locked it.

After the surroundings were completely quiet, the three of them got off the water tanker, and Ye Zhenzhen's first sentence was to question Zhao Dagang, "Why are you here? It's too dangerous!"

Zhao Dagang didn't care, "I'm here, let's not pursue it, besides, it's useful for me to come, I know what kind of place this is." ”

"Where is this?"

"The electrical appliance production plant in Nanwan Town is a factory that was just introduced two years ago. ”

Ye Zhenzhen asked, "Have you been here before?"

Zhao Dagang nodded proudly, "Well, I've been here, I have sent brine goods to the canteen of this factory before, and I often come here, I know the general situation of the factory, there are two factories over there, a little north is the catering center and the staff dormitory, we are here is the warehouse and logistics area, and the big trucks in the factory are usually parked here." ”

Zhao Dagang gestured as he spoke, and Ye Zhenzhen listened to it and asked, "Where is their wastewater treatment equipment?"

Zhao Dagang: "I haven't seen the sewage treatment equipment in their factory with my own eyes, but I heard from the workers in the canteen that since the last time the environmental protection department ordered the factory to be rectified, a lot of equipment has been added to the factory, all in the southwest corner of the factory, not far from the factory. ”

Nan Zhiqiao and Zhen Zhen glanced at each other, knowing that the next step was to find the sewage treatment equipment of this electrical appliance manufacturing plant, if they transported the wastewater to the small courtyard on the hillside in the distance, then the sewage treatment equipment in the factory should not play a role.

"Now where do you want to look? I can show the way. Zhao Dagang actively wanted to help.

Nan Zhiqiao: "Find their sewage treatment equipment first, I want to take photos for evidence." ”

"Okay, I'll lead the way. ”

Zhao Dagang excitedly went to the garage door, pushed it twice, and found that the garage was locked from the outside.

Zhao Dagang's face fell, "We are locked inside, what should we do? We can't get out, and we will be found tomorrow morning." ”

Nan Zhiqiao first took out a slender sampling tube from his arms, collected some green waste liquid from the water tanker tube, and then looked around the garage, in addition to the garage door, there was also a window on the back wall.

The windows were more than a man high, glazed windows, and the latches in the corners were closed.

Nan Zhiqiao stepped on the rear beam of the water tanker, reached out and pulled out the latch, pushed open the window, jumped lightly, jumped on the window, observed the situation outside the garage, and found that there was no one, so he made a gesture to follow the two people in the garage.

Nan Zhiqiao jumped out of the garage from the window, and Ye Zhenzhen also followed Nan Zhiqiao's example and jumped out.

Zhao Dagang usually hunts a lot, and his motor function is not bad, and he easily crosses the window.

The three of them quietly set off along the corner of the wall towards the wastewater treatment plant in the southwest corner of the factory.

The scale of the electrical appliance production plant in Nanwan Town is very large, covering an area of 20,000 square meters, and the roads in the factory area are staggered, although they are in a state of rest at night, the street lights are still very bright.

There are security guards patrolling the factory area at night.

Security guards with flashlights walked back and forth on the road, and the three of them avoided the security guards' sight and cautiously approached the sewage treatment area.

"Look, are those new equipment, the sewage treatment equipment you're looking for?"

Zhao Dagang pointed to the rows of sealed jars in the southwest corner and the pools under the shed, "The people in the factory canteen said that the sewage in their factory is treated by themselves, and two years ago a lot of large jars were added to treat industrial wastewater. ”

Ye Zhenzhen looked at the bottom of the pool, and there was a light layer of pale green liquid in the pool, which was the same color as the liquid she had just seen in the secret courtyard on the hillside.

Vera took out two plastic sampling tubes from her arms and prepared to collect the green liquid in the pool.

Seeing that Zhen Zhen was going to go to the bottom of the pool, Zhao Dagang stopped him in shock: "What are you going to do? Didn't you say that this water is poisonous?"

"Take a sample and keep it as evidence. Ye Zhenzhen explained, and at the same time beckoned to Nan Zhiqiao, signaling to point the hidden camera at herself.

At the edge of the pool, there is an escalator for staff to go up and down, and Vera goes down the escalator, collects samples, and then climbs up the escalator.

Zhao Dagang didn't understand, and asked, "Why are you collecting these?"

"In comparison, we suspect that the ingredients in the factory that were sampled by the environmental protection department are different from the waste liquid that was smuggled away at night. ”

"Ah? And this situation? Isn't it all sewage from the same factory, and the composition is not the same?"

"The same factory, there are different production lines, the process is also different, now the country has a clear provision, prohibiting the use of some mercury-containing backward production technology, the Minamata Convention on Mercury, referred to as the "Mercury Convention", although it has been promulgated, but it is not excluded that some enterprises for the sake of profit, do illegal things. ”

Zhao Dagang didn't seem to understand, but he knew in his heart that the two people in front of him were collecting evidence of the factory's illegal activities, which was related to the progress of the investigation of the mercury poisoning incident in Nanwan Town, and he must help.

Zhao Dagang reminded the two: "I also know a place that is the sewage outlet of the factory to the outside world. ”

Zhao Dagang led the two of them from the edge of the pool and quietly walked to the corner of the factory, where there was a sewage ditch.

One end of the ditch is connected to the terminal nozzle of the factory's wastewater treatment plant, and through the iron fence gate of the factory, it leads to the Nam Wan River not far away.