Pet King

One year, one month, one day.

A sea area.

2oo meters below the ocean surface.

Dusk area.

Under this depth of water, the sun is dark like dusk.

Looking down, below is the dark abyss.

Looking up, it looks like the short blue sky after the sun goes down before the sky is completely dark.

Unlike the real sky, there are no tired birds returning to the forest. Occasionally, there will be a streamlined shadow swimming quickly over the top of the head, which is a large shark in the shallow sea.

This depth is inaccessible to at least half of the marine life, but in the dim light, there are still some things moving quietly.

call--

A shadow swam through at an extremely fast rate, and the body reflected the dim silver light, and few things could cruise in this way in the sea.

It was an adult swordfish close to two meters in length. It was flanked by fencing-like long jaws and roared freely. In this deep ocean, with its outstanding degree, it had few natural enemies except sharks. .

It has large eyes, the size of a tennis ball, and a large number of photoreceptor cells. It is impossible to hunt in this level of light without some special features in the body.

The sharp long jaw, keen vision, body weighing hundreds of kilograms, and short-distance sprints of more than 100 kilometers have made it a proud capital, mad like a harpoon, and even have " The name of "Wearing a Wooden Board" ...

This swordfish is out of luck today and hasn't found anything to eat yet. Hunger has made it an irritable brother. I really want to find something that is annoying to come day by day. Anything is good.

In front of its high swimming route, a **** guy suddenly appeared. The slow swim was a whale.

Even the fastest whale can't eat the exhaust of swordfish, so it is confident to challenge it.

It may be that it is too fast, and rushes to the end without even seeing what the other party really sees. It didn't detect it until it was near, and hurriedly twisted its strong muscles to make a sharp turn. The collision of the opponent.

what happened? Why is this guy's body so long? It is much longer than the largest whale it has ever seen. Its round head, "dorsal fin" is as thick as a reef, and its pectoral fins are almost invisible. The caudal fins rotate and stir the water periodically. Stupid whale ... The most important thing is that the other person's skin seems to be much harder than wood.

Forget it, go and find the soft persimmon.

It swung its tail and swam away, disappearing into the dim light.

The nuclear submarine, which was mistaken for a whale by swordfish, cruised silently underwater at 6 knots. It passed under dozens of different types of boats along the way, including fishing boats, freighters, tankers, and private yachts. He even ventured to get in close contact with warships, but fortunately no one was found.

Behind it is a long "tail" that is longer than any tail in nature. The total length is almost 1 km, including 8oo meters long, less than 1cm in diameter towline and more than 1oo long, consisting of thousands. Sonar array consisting of hydrophones.

The towed sonar array works at wavelengths below 3ooo Hertz, and the lowest effective frequency is 1o to 2o Hertz. At the lowest frequency, the longest detection distance can reach 18o kilometers through deep sea channels and convergence zone effects. It can even be obtained outside the territorial sea boundary Information and topographic features.

Narrow sonar room.

Sonar No. 1 in military uniform and headphones stared intently at the screen in front of him, looking for traces of the enemy nuclear submarine.

All sounds from a range of 18o kilometers are captured by the sonar array, and after being amplified by the output, they are transmitted to the headphone of sonar 1 and the waveform graph is displayed on the screen in front of him through the tuning indicator.

Sonar No. 2 sitting next to him was responsible for the operation of the crotch sonar and the echo sounder.

Sonar No. 1 periodically switches buttons and adjusts the filter, sometimes gaining low frequency and sometimes gaining high frequency, in case an enemy submarine is quietly approaching in the shadow area.

The stubble on the sparse lips proved that he was very young, but he had been on duty in this submarine for a year. He was not a recruit who was panicked when things happened, as can be seen from his calm and sophisticated expression.

A variety of sounds alternately sounded in the headset, and he knew most of them, if not, he would not be qualified to disembark and become the eyes and ears of a submarine.

The nuclear submarine is very quiet, its own noise is very small, and it is far less noisy than the diesel submarine during operation.

He can discern the crisp crackling sound of shrimp bouncing, can distinguish the sharp tweets of dolphins, can distinguish the unpleasant snoring sound of golden drum fish, can distinguish the gurgle of big yellow croakers like a frog ... This kind of incredible insight in the imagination of others is just part of his work and training. He has no hearing different from ordinary people, but just listens more, and remembers-without him, only It sounds familiar.

Suddenly, his straight eyebrows moved slightly, and a strange sound was heard in his ears.

He didn't let go of any anomaly. The waveform on the screen just remained in his memory. According to the intuitive adjustment button, the low-pass filter was turned on to gain low frequency.

That voice is back.

His eyes moved quickly, and he glanced at the frequency slightly. The sound now ranges from 45 to 5o Hz.

Is it a whale?

Submarines often encounter whales. He is familiar with the sounds of various whales. He remembers that some whales can produce sounds in this frequency range, but the specific calls are different from what he just heard.

"No. 2, please confirm the position, the frequency band is 45-5o," he said.

Since the towed sonar is a straight line, it is difficult to confirm whether the source of the sound is port or starboard. Other sonar assistance is needed, or it can be confirmed by submarine maneuvering. Direction, so only the former can be selected.

"Understood." Sonar No. 2 replied neatly, and adjusted the crotch sonar to a low-frequency gain of 45 to 5o Hz.

The same young Sonar 2 stared and listened for a while ~ www.wuxiaspot.com ~ said: "Location o9o, identity unknown."

"Received!" Said Sonar 1.

"Sir!" He took off his headset and called the officer on duty.

"what's up?"

The officer on duty walked quickly and made a sound. He is much older than No. 1 sonar, and is truly mature and experienced. The wrinkles in the corners of his eyes and the rank of his shoulders prove this.

"Suspicious contact, position o9o, sounds like a whale." Sonar 1 reported concisely. ...

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