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The sonar of the submarine is divided into active mode and passive mode, when the opponent's sonar is in active mode and continues to emit sound waves at the submarine, the submarine knows that it is targeted.

During World War II, sonar was relatively primitive, passive sonar surveillance, active sonar search, once the submarine found the enemy ship's active sonar turned on, it means that the enemy discovered your existence, once the active sonar sound wave on the hull suddenly became faster, it means that it has been locked, depth charges and torpedoes may arrive immediately.

However, with the progress of science and technology, the passive working mode of modern sonar is enough to locate the fire control level of the submarine, and the range of action is much higher than that of the active mode, and the passive working mode of sonar has basically become the norm, so it is difficult for the current submarine to know whether the enemy ship has found itself.

However, when it comes to torpedoes, the noise level of torpedoes is much greater than that of submarines, and modern submarines are also equipped with a high level of sonar, once an enemy ship launches a torpedo, the submarine can know, regardless of whether the sonar of the torpedo head is active or passive, it is not difficult to determine the distance and direction of the torpedo.

However, some modern torpedoes will adopt a two-speed mode, low-speed search, high-speed attack, and only when they are about to approach the submarine will they enter the high speed, and the submarine will find it, but it can no longer run away, and can only use decoys and other underwater acoustic countermeasures to interfere with and confuse the torpedo.

The situation encountered by this strategic nuclear submarine of the United States is different, the situation it encountered is similar to the situation of World War II, it is irradiated by active sonar, and it is irradiated all the time, and it is irradiated constantly, and it is about to have a heart attack.

But that's it, the other party didn't make the next attack.

This situation literally made their hearts rise to their throats, and they felt uncomfortable all over their bodies.

It's like "besieging but not attacking", this kind of situation is more uncomfortable than directly attacking, which is equivalent to psychological warfare, and it is the kind that directly hits the heart.

In this confined deep-sea environment, once an accident occurs, it may be an accident in which the whole boat will not survive, so this effect is particularly obvious.

"What the hell is going on? Found them? Where the hell are they shining on us?! ”

"Where did they go again?! Why did it disappear from sonar again? ”

The captain of the United States strategic nuclear submarine was lying next to the sonar officer, and asked with a solemn face.

"Captain, there is still nothing to discover, just like the previous times, the other party is as if they don't exist at all, and we can't find them at all." The sonar officer said with a solemn face, and there was a hint of panic in his tone.

"What the hell, how could there be such a thing, did we meet aliens?" The captain took off his hat and clutched it in his hand and asked the operator next to him, "What about the headquarters, has the headquarters replied?" Are we at war with other countries?! ”

"Not yet, Captain," the operator was also covered with beads of sweat, not knowing whether it was hot or nervous, "Headquarters has not yet answered, not knowing what is going on. ”

"Damn, what the hell is going on, it's not like a war, if it was really a war, the other side should have attacked us a long time ago, how could it only use torpedo sonar to illuminate us."

The captain scratched his hair in great annoyance, and when he saw that the first mate next to him was also frowning and thinking about something, he asked, "Da, what do you think is going on?" ”

"Captain, this is very unusual, I think they are playing tricks on us." The first mate said in a deep voice.

"Trick us?" The captain was stunned for a moment after hearing this, and then looked down at the comprehensive information reported by his subordinates, and immediately reflected, "That's right, the other party is playing tricks on us!" ”

The sudden appearance of the deep-sea submersible had been following them for some time, and it suddenly appeared on its sonar, and then suddenly disappeared, but not by chance, but continuously and for a fixed time.

It starts with one minute, then two minutes, and then only four minutes, then eight minutes in multiples, each time very precisely, and after five flashes, each time it reappears, it is bound to shine itself with active sonar.

But when I found the other party on my side, it was just a moment, and then the other party seemed to disappear completely and never appeared, and I couldn't find the other party no matter how I looked for it, which was also where their psychological pressure increased dramatically.

So keep following, and don't fire a torpedo to destroy yourself, no matter how fast you run, the other party can actually get up, and the distance is rapidly shortening, but when you think you are going to collide, the other party suddenly closes the distance.

If it weren't for the fact that people had repeatedly checked the equipment and knew that their equipment was completely fine, the captain would have thought that the submarine should be overhauled.

However, knowing that the equipment on your side is fine, it further confirms the strength of the other party.

And now I haven't gotten the information from the headquarters, and I can't take the initiative to attack on my side, so if I get into trouble because of this, then I will definitely go to a military court.

The most important thing is that if you want to go to the military court, you may not be able to go to court, with such a strong strength of the other party, if your side really launches an attack, it is a question whether your submarine can safely float.

He concluded that if his side really took the initiative to attack, then there was an 80 chance that he would be killed by the other party, so he didn't dare to take the initiative to attack, so he could only find a way to escape in his own way, and by the way, he kept contacting the headquarters, hoping to figure out what kind of form it was on the surface of the sea now.

"Sir, the headquarters has replied!"

While he was thinking, the operator finally received a reply from the headquarters, and he hurriedly asked, "What's the matter, are we at war with Huaguo or Mao Xiong?" ”

"Sir, no country has officially declared war on us, and the Navy Headquarters has not received any signal to go to war from His Excellency the President and the Department of Defense." The operator said quickly.

"So what the hell is going on?" The captain and first mate looked at each other in confusion.

"Wait, sir, there's a reply from headquarters,......" the operator said hurriedly, and this time he seemed to be frightened by something, and he stammered.

"We ...... Half of our strategic nuclear submarines cruising in the sea have met and ...... Same situation as us! They have all been met with tailgating, and they are all constant intimidation! ”

"What?!"

Not only was the captain and the first mate next to him shocked, but all the staff in the command room were taken aback by this sentence.

Half of the strategic nuclear submarines are exposed, and they may be killed by the other side at any time, what did they encounter?

Are the Atlanteans alive?

Such a situation is already the most critical moment for the United States!

"Hurry up and get back to HQ and ask us what to do in this situation?"

"Is it to float up to show identity? Or is it a direct attack? ”

The captain hurriedly said.

"Okay captain!"

Their situation is not alone, as there are many brothers who are suffering from the same thing as them, and are all anxious.

Without an answer from the headquarters, they cannot act rashly, and the word "strategic" should be added to the strategic nuclear submarines, that is, because they have the ability to surprise and make a final decision.

However, there is a premise here, that is, it cannot be discovered by others, and once it is discovered, it is no big difference from a fixed nuclear facility on the ground, and the deterrent capability is greatly reduced.

When encountering such a thing, Mi Guo is simply going crazy.