In the afternoon, on the island of St. Kaiser, Africa, the command room of the O2 squad of the Black Isle Military Company.

Lin Rui and the others have already received information from Cobain, almost all about the Cheyenne Mountain Underground Monitoring Center and the North American Air Defense Command. The materials include two parts, one is a large number of pictures such as building topography. The other part is personnel information and facility information.

"Judging from these materials, this base can be called impregnable. The monitoring center has more than 200 networks composed of super-large or large and medium-sized computers and more than 600 special communication lines, and the center exchanges information with the outside world through a variety of communication tools such as communication satellites, microwave relay lines and optical cables.

It can receive data from various detection and monitoring means, including military satellite systems, civilian satellite systems, air early warning networks, and ground-based early warning networks, and maintains close contact with the Pentagon, the White House, the United States Strategic Command, the Canadian Armed Forces Command, and major U.S. military bases around the world through a back-up and survivable hotline.

There are more than 1,200 military and civilian personnel in the monitoring center. The building is lit up 24 hours a day, day and night, with constant telephone calls, non-stop telex, and constant screens. Crews rotate day and night, monitoring thousands of man-made objects orbiting the Earth in space and alerting them for possible surprise attacks on North American and U.S. bases overseas from land, sea, air, or space.

All the monitoring and vigilance tasks of the Cheyenne Mountain Underground Monitoring Center are shared by seven departments. They are the Aviation Alert Center, the Missile Alert Center, the Space Control Center, the Integrated Intelligence Surveillance Center, the System Center, the Meteorological Support Center, and the Command Center. This is a veritable command center of the US military.

In addition to these, they also have a logistics support team of 900 people, codenamed 721, consisting of 4 squads.

The 721 Civil Engineering Detachment is responsible for property management and maintenance, operation and maintenance of power systems and environmental control systems, fire prevention and snow removal.

The 721 Communication Detachment is responsible for the operation, maintenance and repair of all computer systems and communication lines;

The 721 Security Detachment is responsible for physical, industrial and information security, access center management, transportation and visitor control, etc. ”

"So it's the 721 security detachment we're going to deal with?" Sergey nodded.

"That's right. According to the information provided by Cobain, the security unit is quite professional and very reliable. Once we are in this base, they will be our main enemies. The head of the security department was Colonel Joseph, who was once an elite member of the army.

He served in the 101st Air Assault Division and participated in the wars in Afghanistan and Iraq. The year before last, he was transferred to the Cheyenne Mountain Underground Monitoring Center as the head of security. The security force under his command are all experienced members of the guard force. Shogishi replied.

"Nothing to great use. Sergei shook his head.

"That can't be said, compared to the average U.S. military, they are still quite powerful. And they're much more familiar with the terrain inside the base than we are. Lin Rui shook his head and said, "You can't underestimate them too much." ”

"Is there a plan for how to infiltrate?" Crazy Horse frowned, "This kind of test won't let us drive a tank to attack, right?"

"Even tanks can't open the gates of underground fortifications, but they are protected against nuclear weapons. So the onslaught is a joke. Lin Rui shook his head and said, "I think it still depends on Cobain." If he was able to hack into the other party's computer system, he could let us in with a fake identity. At least a few passes before entering the base are not a problem. ”

"How many checkpoints before you enter?" Sergey said with a frown.

"Yes, the staff on duty will first verify the authenticity of the identity, then check if there is an appointment, and may ask some questions. Then there's the verification password and ID card. These ID cards are able to read information and argue whether it is true or false. But if Copin controls the computer, he can fake it and think that the fake is real. We'll be able to blend in without a hitch. Shogishi replied.

"But what if Cobain fails?" said Crazy Horse with a frown.

"Then we have to think of other ways. But IMHO, the other approach is much riskier than that. Shogishi shook his head.

Lin Rui nodded, "It's true that it would be difficult for us to do it without Cobain's assistance, but Crazy Horse's worries are not unreasonable, we can't put all the bets on Ke himself, in case of an accident, we still have to have other ways to deal with it." ”

That's what I mean. Sergei nodded, "Maybe we should think of other ways to get in." In general, there will be other exits from this base. For example, in the event of a fire or other disaster, shouldn't their personnel have other evacuation routes?"

"You think too much, at least according to the drawings, there is no other exit at all. You said that once the fire alarm or something, they do have evacuation routes, but not to the surface, but to other areas underground.

It's a huge underground facility, and it's very well set up. It's completely different from the underground bases we've encountered before. Below is almost a separate underground town, with access to large trucks. There is no need to think about the problem of diversion at all. Shogishi shook his head.

"Ventilation, there must be ventilation for such a huge facility, maybe we can sneak in from there. Sergei frowned.

"It's not possible. Because of the danger of nuclear tank attack, their ventilation ducts are specially honeycombed design, and dozens of fans are maintained in various underground areas to ensure air circulation. We can't get through these passages. Unless you can turn into a rat or a cockroach. Shogishi shook his head.

"And what about electrical and communication pipes? Or water pipes. Sergei didn't give up and said, "There is always a passage connecting the outside and the inside, right?"

"We can't get through the electrical and communication pipelines, and they don't have a water supply at all, because there is a large cistern inside the cave, and there is a lot of high-quality groundwater, which is enough to supply thousands of people in this base. Lin Rui could only smile bitterly.

"Damn, isn't there really any other way to sneak in?" Sergei frowned, "and how about digging a tunnel?"

"Okay, maybe you can dig a tunnel into it, but it's all very hard rock formations. It was in order to prevent a nuclear bomb attack that the Americans built a base under a 500-meter-thick rock formation. To dig through this tunnel, you'll have to find a construction team to do it for you. And it's going to take years. Shogishi shook his head.

"Damn it. Sergei shook his head.