– Yes. The system's program tracks the boundaries originally put into it.

– Can't be changed?

Ivashov was silent for a moment. Rutra recognized that there was some mystery in this, and perhaps part of the "cipher" to the solution, and, to conceal it, did not inquire, though they both realized that they had said what they wanted to say to each other.

– The system is the only existing doomsday machine in the world, a weapon of guaranteed retaliation, the existence of which has been officially confirmed. There are similar systems, but they are very dependent on human error. The system is extremely classified and is still on alert to this day, so any information about it cannot be confirmed or denied. Even for military personnel with high level security clearance. In essence, the Perimeter system is an alternative command system for all branches of the military that have nuclear weapons in service. It was created as a backup system in case the key nodes of the Kazbek command system and its communication lines were destroyed in a first strike, in accordance with the U.S. concept of limited nuclear warfare. As you are of course aware, Kazbek is a device that stores the codes to activate a nuclear arsenal. To ensure guaranteed fulfillment of its role, the system was originally designed to be fully automatic. In the event of a massive attack, it is capable of making a decision to retaliate on its own, without human involvement. It is the only deterrence factor that provides real guarantees that a potential enemy will reject the concept of a preemptive crushing blow. To complete the picture, it would be good for you to find out who of the system's creators is alive, where they are, and whether it is possible to meet them.

– Most likely," Ruthra agreed, and then asked, "I take it the problem didn't come on suddenly, but was dealt with thoroughly.

– What did you think," Ivashov replied, shaking his head. – Do you realize what we are talking about, the scale and risks involved? To be frank, since we are a supranational, worldwide service, very, very influential people are interested in solving this problem.

– Yeah, I've already realized it's not an easy question. And the solution to finding the cause is likely to be unconventional. So I need to know everything about who had access to the secret.

– I was dealing with the problem itself. A signal failure. Or rather, a duplicate, unauthorized signal. It's not that simple. You realize how high this is, except, uh.

The general did not finish, he was silent, thinking about something.

– What?" asked Ruthra, staring at him intently.

– Later," he replied, rubbing his temples. – For now, I will tell you about putting the system into combat mode. The first launch of a command missile with the equivalent of a transmitter was successfully conducted on December 26, 1979. In January 1985, the complex was put on combat duty. For 10 years, the command missile complex successfully performed its important role in the defense capability of the state. Then it had to be shut down under the treaty, but it turned out that it was impossible to turn it off completely.

The general stopped speaking, looked at Rutra's desk, where there was a package with a red stripe crossed out.

– Have you been to Sukhov's? – he asked.

– Yes, we collect all the data, including the work done.

– May I know the results of their investigation?

– I think so," Ruthra said and began to open the package.

Inside were documents about the system, a description of the constituent parts.