After getting off the car, Tasnim's eyes almost stared at the submarine.

The elongated water droplet linear type has a conical tail, a shell rudder at the front and a cross-shaped tail operation surface layout at the tail, with 4 tail rudders and a single-axis single paddle.

Since there is no need for water navigation, the submarine is designed with high underwater speed. From the appearance of the hull, it can be fully seen that only by using a nuclear reactor can the submarine's unlimited underwater endurance be guaranteed. This is what submarine soldiers most hope to have!

Hull number 403, this is already an improved Type 091 nuclear submarine.

Continuing to move forward, Tasnim saw the surface of the hull, which seemed not to be steel, and suddenly showed surprise in his eyes.

"Has the surface of this submarine been laid with silence tiles?" Tasnim said.

Silencer! The biggest detection method for a submarine is underwater is sonar. The sound can be transmitted in the water. If you want to discover the enemy, you must have efficient sonar. If you want to avoid being discovered by the enemy, you need to have a means to reduce your noise.

All mechanical equipment is placed on the shock absorber and uses advanced propellers and other means. One of the very important ones is to lay sound silence tiles!

On the surface of the submarine, a layer of underwater sound-absorbing material is used. This material is almost elastic. When sound waves pass through, the elastic sound-absorbing material will deform, and returning to its original state also requires a process. In this process, the deformation lags behind the change of stress, which makes the sound energy transform into heat energy and loses. This can reduce the sound of your own submarine. At the same time, when the other party's active sonar is used to detect, the echo of the active sonar can also be reduced and the detection distance can be reduced.

Since this sound-absorbing material is laid on piece by piece, just like a tiles on a roof, this sound-absorbing material is vividly called a sound-absorbing tiles.

During World War II, Germany began to develop the technology of sound silence tiles. During the Cold War, the United States and the Soviet Union fought for hegemony and each developed its own sound silence tiles. After the 1970s, both submarines began to lay their own sound silence tiles.

In addition to the United States and the Soviet Union, other countries such as Britain and France are also developing their own sound silencing tiles. After all, this thing is a technology kept confidential by various countries.

China's technology is very backward, which is also a concern for President Mhamad. If the submarine is too noisy, then it will be the same as if it is not.

Now, seeing the surface of this submarine is laid with sound silence tiles, it means that the submarine still attaches great importance to its own noise level.

"Yes, the first two ships did not use sound silence tiles. From our third ship, there were these sound tiles." The captain who came to receive the submarine. Because he was underwater for a long time, unlike other soldiers, the captain in his forties in front of him had oily and fair skin. At this time, he looked at the Pakistani in front of him and said quietly: "But there are still some problems with our sound tile that have not been solved. After sailing at sea for a period of time, some sound tiles began to fall off and after they came back, they needed to be re-layed."

Such secrets are not secrets in front of friends in Pakistan.

In addition to being able to silence sound, the laying is also very complicated and the process is not in place. It is easy to cause shedding, which is a problem encountered by both the United States and the Soviet Union.

You can see pictures of Soviet submarines. When they float to the sea, you can often see something like scars on the surface of the submarine, that is, the sound silence on it fell off. This problem was not completely solved until the collapse of the Soviet Union, let alone China now.

It’s not scary to fall off, just stick it back when you come back.

"Please get on the boat," said the captain of the Chinese submarine.

The submarine is different from other warships. There are no steps here. From the front hatch door, you can climb down the ladder directly.

Several Pakistani naval officers followed the Chinese captain with great interest and watched everything inside.

"There is a torpedo compartment in front." Since it comes up from the front, we naturally have to first watch the equipment in front.

Although conventionally powered submarines have different structures from nuclear submarines, one thing is the same, that is, the ship's caps are torpedo compartments and sonar compartments.

Generally speaking, the upper half is a torpedo tube and the lower half is an array of sonar. Now, after entering the torpedo compartment, Tasnim frowned a little.

The loading is still done manually, and you can even see manual equipment such as gourds. Such loading efficiency is undoubtedly very low. Now, both Tr-1700s in Pakistan have automatically loaded torpedoes.

For a long time, China was facing a military blockade from the West, and it was impossible to obtain advanced Western technology. Submarines only had old R-class submarines in China, so many technologies were backward. When torpedo loading could be operated manually, it obviously would not be equipped with advanced automatic loading equipment. In China, labor costs are very low.

It seems that even if the technology of this submarine is introduced, Western equipment must be used to improve it!

In the torpedo cabin, you can also see some sleepers. The space in the submarine is limited, so it is very comfortable to sleep in these empty places, so it is not necessary to squeeze the hot shops.

Hot shops are a unique name for submarine soldiers. When the space inside the submarine is insufficient, the sleeping place will be short. In this way, not everyone has a fixed bed to sleep. Many times, two people, or even three people, can have a sleeper. If there are three people, there will always be someone sleeping on the sleeper every eight hours of shifts, so it is called a hot shop.

It also takes courage to sleep on these torpedoes that can explode at any time.

"The central part is the command area." The captain continued to visit with his personnel. The cabin doors were not big, and each one was round. You had to raise your legs to step over. After all, there were many dangers underwater. In case of an accident, such as a cabin, the cabin door would be closed in a short time to isolate the cabin, so as to prevent the submarine from floating forever due to insufficient reserve buoyancy.

Submarine soldiers must have a slender figure. If they are a big fat man, it will seriously affect the passage.

Looking at the aisle, there were all kinds of pipes, switches, and instruments. Hussein, the eagle in the sky, couldn't even see it, and each one was very interesting.

Tasnim is observing the internal structure of the submarine to see if it is reasonable.

The middle part is the place with the least noise, with sonar room, command room, etc. all here.

If it were a conventional submarine, the lower half would be gone and all occupied by batteries, and the place was obviously much wider.

Open the door of the sonar room and you can see the iron console, an old-fashioned screen, and the huge earbuds.

"Is there only one sonar?" Tasnim asked.

"Yes, our submarine uses the domestic duu-5 passive sonar." said the captain.

In terms of electronic technology, China has a big gap with the West. When developing nuclear submarines, many equipment could not be equipped in time, and these submarines were upgraded in batches.

Tasnim couldn't help but shake his head: "It's better to have a tow sonar to detect enemies better."

When a submarine is underwater, it mainly relies on listening to sounds. The more units of this sonar, the farther the distribution, the easier it is to discover the target.

The helicopter casts sonar buoys to form a large base array. For submarines, in addition to using sonar on the bow, they can also be equipped with towed sonar and dragged to a far behind the submarine, which can increase the detection distance exponentially.

"We also want to have to have towed sonar, but..." The captain of China also smiled bitterly.

Who doesn’t want to own good things? The problem is that it can’t be made in China! In fact, the first set of towed sonar from the Chinese Navy was equipped on the Shanghai-class destroyer, and it uses French goods.

When he walked into the command tower, Tasnim felt that the equipment inside was not as advanced as his diesel-electric submarine, and he couldn't help but secretly wonder in his heart that if it was really introduced, he would probably have to change Western electronic equipment on a large scale!

Continue to walk towards the rear cabin, and it is the power cabin. After using nuclear power, the submarine can almost sail underwater endlessly. The specific self-sustaining power depends on the endurance level of the crew. When the Americans conducted an underwater global sailing, the crew inside were almost carried out when they returned to their home port.

Among submarines, the engine soldiers are the hardest, and this is the hottest place. Moreover, in order to maintain the power system, the engine soldiers are almost shirtless and covered in oil.

Here, since it is replaced by nuclear power, the work of the turbine is also very easy. It is nothing more than monitoring the nuclear reactor to see whether it is operating normally, whether the steam pressure is normal, whether the steam turbine is working normally, and when necessary, start the emergency unit.

Of course, their pressure is the greatest, after all, this is a nuclear reactor! Once there is a failure, such as a nuclear leak, they will be the first to be affected and even risk their lives to carry out emergency repairs.

The huge steam turbine unit is placed on the shock absorber base, and the bandages of various pipelines are very tight. In terms of machinery, Tasnim really can't find any problems, but the electronic equipment is too backward!

"We are using a pressurized water reactor with a power of 90 megawatts," the captain said. "It can push our nuclear submarines to speeds of more than twenty-five knots."
Chapter completed!