Although the Falcon tried his best to turn the direction of the speedboat, they were still within the range of the large-caliber cannons, and at this time, the rotary cannons in the hands of those power armor had already begun to spin, trying to escape the range of the cannons before they were torn to pieces by the dense rain of bullets, and this speedboat with conventional power alone would never be able to do it!

"Jump ship! Dive in! After Qi Lin finished speaking, he plunged into the artificial river, and the other three did the same-

In the next second, the speedboat was directly swept away by the cannonballs of the machine gun and exploded into a huge fireball!

The body of water blocked the blast waves, flames, and splashes of fragments from the explosion, and the four of Qi Lin dived to the bottom of the water in one go, took out the breathing mask from their backpack, and buckled it to their faces.

"Implement Plan No. 2." Qi Lin gestured to the other three, and the third nodded, and immediately swam to the front.

Despite its size, the river is a stagnant water, and compared to the natural water system with its rich ecosystem, the self-purification capacity of the artificial river is almost negligible, and without a man-made purification system, the river will quickly become foul-smelling, microbial multiplication, and then eutrophication - in the old days, many ancient city moats had similar problems.

However, the water quality of this artificial river is still so clear and clean that it is above the standard of Class II drinking water, and no one who knows anything about it will believe that there is no complete set of purification systems attached to it.

Generally speaking, to keep such a large man-made river clear, it is necessary to have at least a water purification plant of the appropriate size.

What No. 3 has to do is to find the passage that connects with the river and the purification plant, and use this passage to enter the interior of the purification plant.

On the structural diagram of Vault 444, this passage is not marked, but near the core area of the wealthy area, there is indeed a fully automatic sewage treatment station.

The sewage treatment plant covers an area of 1.9 square kilometers, and according to the standards of the old era, a sewage treatment plant that treats more than 10,000 tons of sewage per day generally covers an area of no more than two hectares, and this nearly 200-hectare sewage treatment station can definitely treat more than one million tons of sewage per day......

No matter how luxurious the rich area of Vault 444 is, there is no such industrial facility that produces a lot of sewage in the rich area, let alone one million tons of sewage a day, and even producing 100,000 tons of sewage may be a limit.

Then, this sewage treatment plant is obviously a bit "overcapacity".

Thinking that there are no other similar facilities in the wealthy area, Qi Lin and the others are almost certain that this sewage treatment station is responsible for treating the sewage of daily life in the rich area, and must also be responsible for the task of purifying the artificial river.

And the residence of Chairman Edas is less than three kilometers away from this sewage treatment station, and as for the control center of Vault 444, it is even on the edge of this sewage treatment station!

……

The four of them swam more than 100 meters under the water, and finally found a circular channel mouth with a diameter of more than two meters on one side of the riverbank, and a huge propeller was installed in the channel, and the rotating blades of the paddle continuously introduced the river water into the channel.

"Blasting." Qi Lin made a gesture, and Falcon and No. 3 immediately swam over, took out two plastic explosives similar to plasticine from their backpacks, twisted them together, and threw them into the passage.

With the current of water, the two explosives were immediately sucked into the propeller, and then, a muffled sound came from inside, and the propeller slowly stopped rotating.

"Let's go." Qi Lin took the lead in burrowing into the passage.

It is estimated that the designers of Vault 444 could never have dreamed that an intruder would choose to enter the hinterland of the wealthy area through this passage, so there was no defense in it, and even the valve used for manual maintenance was not locked.

Through this passage, the four of them finally entered the interior of the sewage treatment station, and at this time, Coren did not seem to notice his movements, and there was no trace of any parasite near the sewage treatment station.

"What do we do now? Do you continue to the residence of the chairman of the foundation or take down the control center of the vault first? If we can capture the control center, the entire defense of the Vault will be used by us. Falcon asked.

"Control the center...... Now I guess it's been taken over by the mastermind, Four, if you are allowed to enter the control center, will you have the confidence to take control away from the mastermind? Qi Lin glanced at No. 4 and asked.

"I can't do it. If I had that ability, I wouldn't be here. Four shook his head.

"And the defenses inside the control center are far more dense than we imagined, and we may not even be able to touch the doorknob of the control room." Three added.

"Looks like this won't work, by the way, what's that, is it the transceiver inside the vault?" Qi Lin's eyes looked out through the factory, and he saw that next to the control center, stood this signal tower more than 30 meters high, and the lights on the signal tower were still flickering rhythmically, proving that this thing was now in working condition.

"No, most of the facilities inside the shelter are wired...... That cell tower should be...... Four, take a look, is the intensity of electromagnetic interference in the area we are in now getting bigger? As if thinking of something, Number Three said suddenly.

Number Four immediately took out the communication equipment, glanced at it twice, and nodded: "That's right, the electromagnetic interference here is hundreds of times stronger than in the ghetto, and the radio equipment is almost impossible to work in this environment. ”

As he spoke, Number Four turned on the radio communication between the teams, and the noisy sound of electricity in the headset made Qi Lin and the others frown.

"The tower...... It should be the source of interference! Number Four instantly understood the meaning of Number Three's words, and said with some excitement.

"In other words, if we knock that thing down, we can restore communication with headquarters, right?"

"Yes, without interference, this communicator can travel up to thirty kilometers, and before entering Vault 444, I will bury a miniature base station every ten kilometers, through which we can send a signal in just 16 seconds to reach the organization's headquarters."

"That's good." Qi Lin smashed the glass window in front of him with the butt of his gun, picked up his Gauss rifle, and aimed at the metal structure jamming tower.