Under the pitch black, the submarine moves slowly with the current like a blind man, and can only rely on sonar to obtain information from the outside world.

A German-made Type 209/1200 submarine is on a training mission, slowly sailing 50 meters below the Sea of Marmara. It is subordinate to the Gorkuk base of the Tuji Navy, with the port number S-350 and the name 'Ildire'.

Deep diving training lasts for a month, which is a difficult time for a conventional submarine with only about a thousand tons. The thirty-three crew members in the boat stinked like salted fish. Everyone wanted to get ashore as soon as possible and take a good vacation.

In the command cabin, the captain was not there. The sonar soldier stared at the underwater acoustic display console, but was chatting with the electromechanical non-commissioned officer next to him. The Sea of Marmara is an inland sea, and they are not at all worried about any danger here.

The Sea of Marmara is a closed inland sea with a large enough depth of water. The dead hairs in the north have collapsed on their own, and the native chickens have no foreign enemies, so there is no need to worry about anyone coming to find any trouble.

The crew did not observe the discipline of silence, chatting about where to find women and which bar to go for a drink when they got ashore. They do this on a daily basis, and they are a little careless in between trainings.

It's so stuffy in the submarine.

Just as the crew was thinking about how time could pass faster, there was a 'bang' in the command cabin, as if someone was knocking on the door.

No...... The entire command cabin heard the voice. Exactly, the whole submarine heard. The voice was too strange, too clear.

The mechanical and electrical non-commissioned officer looked up in fright, but the space in the submarine was small, and the command cabin was a big place. He was most afraid of something going wrong with the pipes inside the submarine.

The sonar soldier hurriedly looked at his display console, but the sonar did not show any abnormality.

What's going on?

The captain of the boat is resting, and the non-commissioned officer of the mechanical and electrical department temporarily takes over the command post. He hurriedly grabbed the internal microphone of the command platform and asked if there was any abnormality in each post.

The reports of each post were normal, but they also made it clear that they all heard abnormal noises, as if they were coming from outside the boat. The underwater environment is complex, and no one knows what lies outside the heavy hull?

Just as the crew was worried about the strange noise, the strange sound sounded again at an even stronger volume. It was as if someone was beating a drum outside the boat, and the sound of 'dong dong dong' was endless.

The whole boat was alarmed, and soon the captain hurried from the officers' lounge wearing only a pair of trousers, and asked loudly what was going on.

But no one in the boat knew exactly what was going on, except for growing panic. The sonar display console still shows that everything is normal, and there is nothing wrong with the submarine surroundings.

"Float." The captain decisively ordered.

If you can't figure out the situation, let's float to the surface first. There are no great secrets about the submarines of the local chickens. They weren't far from the base port, and there was absolutely no need to venture underwater.

The sudden sound was so weird that all the posts in the boat were in place. The high-pressure gas enters the ballast chamber with a screeching sound, pushing the water out of the boat. The submarine thus slowly ascended.

The 'Ildire' is now fifty meters underwater, and it will not take long to rise. But not long after the ascent, the power cabin suddenly reported a terrible news.

"Captain, the pressure pipe in our cabin is broken."

The submarine is full of pipes of various functions, many of which are full of high-pressure liquid, and once damaged, they cannot be blocked at all. To make matters worse, there was also bad news from the electromechanical compartment, the left ballast compartment of the submarine was faulty and could not drain seawater.

Everyone in the boat heard a creepy creak - the sea water was surging into the ballast tank on the left, causing an uneven force on the submarine's hull.

A whole egg is hard to crush. But if the egg is broken, it doesn't take much effort to crush it.

Put simply, the sea could have squashed the underwater warship. Even if it is not squashed, the submarine will be unbalanced and the consequences will be unimaginable.

"Decelerate to zero, fill the right ballast tank."

The 'Ildire' was losing control and was tilting to the left, and the captain's first thought was to stop first and load to the right to restore balance. If it doesn't work, he can simply sit at the bottom of the sea and wait for rescue.

The Sea of Marmara is less than 200 meters deep at its deepest, and the Type 209/1200 is fully capable of withstanding it.

In order to survive, the crew did their best to complete the captain's orders at a speed far exceeding their training. If they were usually proud of this, but today they are terrified, as if they were facing death.

After a few minutes of intense operation, the ballast compartment was fine, and the tubes in the power compartment were blocked. The strange sound of 'knock knock' just now has also disappeared.

But the submarine floated as if it were stationary, about fifty meters below sea level. And it was still fifty kilometers away from returning to the port, and the thirty or so men in the boat wanted to cry without tears.

"Send a distress buoy and call for help from the port." The captain commanded.

Type 209/1200 submarines do not have separate escape capsules. If you want to escape, either rescue the submarine on the surface and pull the entire submarine back to the surface safely, or the crew swims out of the torpedo tube to play 'free floating'.

On the submarine conning tower, a distress buoy was sent out. The command of the submarine fleet in Gorkuk immediately received information - a 209 submarine broke down on the way back?

Now there are only six submarines in Tuji, all of which are German-made Type 209/1200. Each one is too precious to be lost.

But now that the situation is known, how can I save it?

The exact location of the distress buoy can be known through radio direction finding, and a Bell 212 helicopter from the base set off overnight, along with a Coast Guard patrol boat.

See what's going on on the scene?

The Navy's frogmen were also ready to go to sea to save the hapless 'Ildire'.

But then what?

The Native Chicken Navy is also a bit blind. They don't have a professional submarine rescue ship now, and after confirming with the submarine many times, they can only contact civilian ships in the port overnight to serve.

Without waiting for the civilian salvage ship to arrive, the news of the accident of the Tuji submarine disappeared. The Western media know about it, and it just so happens that there hasn't been any big news recently, so pay attention to it.

The crew of the 'Ildire' was uneasy underwater, desperate for help. Not long after, the distress buoy sent back a message that 'Gorkuk' was organizing a rescue, keeping them calm and reporting the situation at any time.

The captain has already reported the situation encountered by the submarine, and the continuous violent abnormal noise is specially marked. The crew put on their underwater escape gear, and the long wait followed.

The distress buoy is a radio transceiver with steel cable reinforcement, cable connection, and communication function. Not only can it communicate with the headquarters on an encrypted basis, but it can also accept ordinary communication from the outside world.

It didn't take long for the crew to learn that the news of their distress had spread, and the Western media knew about it - there was no big news recently, the daily secret submarine was suddenly exposed, and the gossip crowd had moved a small bench.

There is also radio chat between shipping vessels.

"I heard that a submarine sank nearby."

"It's a major danger, and it hasn't sunk yet."

"Rescue ships from the port have been dispatched and the situation does not seem to be good. I'm afraid it's still going to sink. ”

"It's not safe under the water, or it's not easy for us to sink when we float on the surface."

"Yes, yes, at least a few tens of meters deep, a hole will sink immediately."

Ships came and went on the sea, and the crew 'had nothing to do with themselves, hanging high', chatting happily.

The crew of the 'Ildire' under the surface of the sea is mad - can you not sink one by one? We're listening right next to you. Now it is taboo to hear the word 'Shen'.

(The official account 'All Eats Daoren', can you help with it?) ）