Hearing the briefing from sonar officer No. 1, the officer on duty took a deep look at him, knowing his level, he wouldn't even be able to tell whether the target was a whale or not, so he took the spare headset and put it on his head.

Sonar 2 also began tracking the anomalous sound.

The trio held their breath, and the already quiet sonar room was even quieter than they could breathe, and based on the results of their judgment, they would decide whether or not to report the anomalous contact to the captain.

Half a minute later.

The officer on duty breathed a sigh of relief, his look of vigilance gradually disappeared, and a knowing smile appeared on his face.

"It turned out that an old friend had returned. He chuckled to himself.

Sonar No. 1 had hardly seen him smile while on duty, and when he saw him like this, he couldn't help but ask, "Sir?"

"Don't worry, it's a whale. The officer on duty said firmly.

"However, ......" No. 1 sonar did not blindly obey the commander and still wanted to raise objections.

The officer on duty waved his hand, "That's a whale, but not an ordinary whale...... To be honest, I didn't expect to hear it again. ”

There was a rare look of amazement on his face, and he sighed, "It's been so many years, and the last time I heard it, I was still sitting in your place, as young as you......"

Sonar No. 1 and Sonar No. 2 stared at each other in confusion, unable to understand what the officer was talking about.

The officer on duty smiled slightly, "It's not surprising that you're too young to hear it, of course. Its voice has been absent for many years, so it is not on your training sessions...... I always thought it was dead and I could never hear it again, but now it sounds, it's still alive and well. ”

"Sir, what the hell is going on?" Sonar No. 1 couldn't help but be dumb by the Chief's riddle.

"It's 52 Hz, haven't you heard of it?" laughed the duty officer, "it was a legend in my day, and my sonar of my generation knew it. ”

Sonars 1 and 2 seemed to have a slight impression of the name, but couldn't remember it for a moment.

"But, sir, it's not 52 hertz......" Sonar No. 1 said hesitantly, not wanting to interrupt the chief's good mood, but his duty was that he had to question it.

"Because it wasn't a long time ago. The officer on duty replied.

The two sonars stared at his face, waiting for him to explain further.

"It's 52 Hz, a legendary whale that people call it 'the loneliest whale in the world' because it has a very unique sound frequency that is so different from other whales, so it can't communicate with other whales. The officer on duty fell into reminiscences, "I remember one time, the submarine I was in passed by it, the closest distance was less than 1 nautical mile, when I suddenly had an impulse to activate the active sonar in the bow, respond to its voice with the active sonar, tell it - I heard you, I am right next to you, you are not alone." ”

The two sonars looked at each other, surprised that the chief had such an unknown past.

"That'...... Did you do that?" asked sonar officer 1 curiously.

You know, if there is an enemy submarine nearby, activating the active sonar may reveal your position, and even operational mistakes cannot be forgiven, let alone initiative.

"What do you say?" replied the duty commander angrily, "we are soldiers, and military discipline is like a mountain, and we must not neglect our duties in combat duty and act recklessly for our own selfish desires, which may bring disaster to the entire submarine...... I'm just thinking about it, if I had done that, I would have been court-martialed, and I wouldn't be standing here talking to you today!"

Sonar No. 1 grimaced at No. 2, and the two of them snickered secretly, which was their age-appropriate expression.

"And then?" asked sonar No. 1 again.

"No later. "I encountered it once, and I haven't encountered it since." Heard that no one else heard it again...... At first, some people said that it swam to other seas in search of its kind, others said that it died, encountered a school of killer whales, or encountered a whaling ship...... Over the years, people have forgotten about it......"

He suddenly slapped his head, "Speaking of this, I just remembered, I made a bet with someone back then, I bet that it wasn't dead, and another slut insisted that it was dead...... His grandmother's, after I go back to the base this time, I have to ask for the bet of the year, and I have to count inflation and interest!"

The two sonars laughed dumbly.

"Sir, did you regret not doing that at the time?" Sonar 1 asked suddenly, stopping his smile.

"Sometimes I regret it when I think about it. The officer on duty frankly admitted, "It is rare to have a few times of enthusiasm and impulsiveness in life. ”

"Do you want to make amends?" asked Sonar 1.

Sonar No. 2's smile froze on his face.

The eyes of all three fell on the button of the bow active sonar at the same time.

They have found no trace of enemy submarines in the vicinity, and neighboring countries have no plans to hold military exercises in the near future, so the possibility of enemy submarines in the vicinity is very low.

But......

The headphones still echoed with the whale song, which was very different from the other whales, and the sonar room seemed quieter.

Sonar No. 1 knew that he had asked the wrong question, and his forehead sweated slightly—if the chief really wanted to make up for his regrets, then the future of the three of them would be ruined here.

"Hehe, what are you thinking about?"

The duty commander patted him on the head and said with a smile: "I have a lot of regrets, how can I make up for it? Besides, if there are no regrets left in life, is it still life?"

The stone in the hearts of the two sonars fell to the ground, and the sweat had soaked through the military uniforms on their backs.

Sonar No. 2 glared at his companion fiercely, meaning to see how I will clean you up after I go back......

The interaction between the two of them was fully watched by the officer on duty, and the wrinkles in the corners of his eyes deepened, because the person he had bet with back then had also played with him in the sonar room like this, and had heard 52 Hz with him like this......

So many years have passed, and the two hairy boys who used to sit side by side in the sonar room are now married, serving on two different submarines, and only the bet they made back then still remains in their memories.

He smiled relievedly, sure enough, he was old.

"Stop playing, be on duty. He patted them on the shoulder and said, "If you encounter this incident of 52 hertz, you can brag to others when you return to the base." ”

The two sonars immediately retracted their smiles and sat upright.

"By the way, sir, what kind of whale is 52 Hz, and what does it look like?" sonar No. 1 couldn't help but ask one last question.

The officer on duty shook his head, "I don't know, as far as I know, no one has ever seen it - although I was very close to it that time, after all, the submarine has no windows." ”

Sonar No. 1 was a little regretful, but there was nothing he could do.

The two sonars took their minds away from the long story and prepared to get back to work, and since the suspicious sound was indeed coming from a whale and not an enemy submarine, there was no need to report it upward.

The officer on duty was about to take off his spare headset and return to his post, but his movements suddenly stopped.

Surprised looks flashed across the faces of the three of them at the same time!

Again!

Another unusual sound!

Also from the 45 to 50 bands!

The two sonars quickly moved without waiting for the commander's instructions, and confirmed through the towed sonar array and the bow sonar that the two voices were not from the same source, and that one always stopped and the other sounded, as if they were singing and harmonizing.

They looked for instructions from their superiors.

This time, even the officer on duty was stunned.

What's going on?

"Sir, will it ...... Is this another submarine responding to it, just like you wanted to do but didn't......" Sonar No. 1 said cautiously, peeking into the officer's face.

Officer on duty: "......"

What country's submarine sonar is so crazy? Do you really want to be court-martialed?

This time, a cold sweat broke out in the minds of the officers on duty, and the submariners have all been strictly trained and are absolutely 100 percent obedient to military discipline, no matter which country's submariners are like this, and they will not put the submarines and their comrades-in-arms in danger because of a trace of romantic feelings passing through their hearts.

None of the three spoke, silently listening to the two unique voices of singing and harmonizing.

"It's not sonar. I don't know who said it first, and it was immediately tacitly acquiesced by the other two.

The sound of the response is tactful and varied, and it is not the same as the sound of 52 Hz, which proves that the sound of 52 Hz is not recorded and played back, which is not possible with active sonar, and it is not designed that way at all.

It's not sonar, that's ......

The officer's heart on duty suddenly moved.

"I see. He wiped the sweat from his forehead and laughed very comfortably, and the regret left over more than ten years ago also disappeared in the laughter.

The two sonars waited awaited his explanation.

"It has finally found a companion, a companion with whom it can sing the same tune. The officer on duty smiled, "Only this can be explained, after so many years of lonely searching, it is finally no longer lonely." ”

The two sonars suddenly realized, it turned out to be like this!

52 Hertz no longer needs them to risk violating military discipline to respond, because it has found a companion who can respond to it, and has gained peace of mind.

"Sir, do you want to report this when you get back?" suggested sonar officer 1, "lest the other sonars get bothered by this." ”

The officer on duty took off his headphones and smiled: "You are the first to hear it, or you decide." However, I think the news will spread quickly, after all, we are not the only submarine cruising under the seemingly calm ocean. ”

With that, he left the sonar room with strong steps, as if the burden on his shoulders had been partially unloaded from the young man.