The commander was sweating profusely, he didn't know why the doctor was so insistent, was what was really so important to him?

"The pressure outside the cabin is already approaching 600 kilopascals," this is the water pressure he has never experienced before, and he really doesn't know how long the U-boat can hold out in this environment.

The doctor didn't answer, but his face was serious and he didn't say a word.

Click!

A crisp sound made everyone's hairs explode, and with the diesel engine at its lowest power, the submarine was still quiet, and the crisp sound was so clear.

"Quick, check if there is a pressure imbalance, a broken pipe, and a leaking pipe. The commander shouted, and several seamen immediately ran to inspect various parts of the submarine, at this depth, once a certain pipe flange is not tightly connected, or there are cavitations welded between the cabins, it is simply impossible to withstand the pressure of more than 600 N per unit area.

The lights in the cabin had long since been changed to red, and all the crew's eyes had to adjust to the dim environment.

Several minutes had passed since the U-boat entered the hole, and even if it was slow, it had already advanced a considerable distance.

There was a hole so large under the sea that it was almost even more astonishing than the Marianas, and the sonar through the footage showed that the hole was so neat that there was no obstacle other than the coral at the mouth of the hole.

"Doctor, do you really want to go any further?" the commander asked, he didn't say the second half of the sentence, he had a feeling as if the submarine was no longer sailing in the ocean, but was heading to another dimension.

"Commander, when you are old, don't you regret for the rest of your life that you missed the world's greatest secret because of your cowardice?"

"Of course, my personal life can be sacrificed," said Commander Zhengse, "but now is the time when the Emperor's ** power is most needed, and a U-boat is a very important asset for the Empire. ”

"Relax, officer, there's so much I can't tell you, but you just need to know that our mission this time is a huge part of the Empire's leader's plan, even more important than an entire submarine wolf pack formation. ”

"So," he said, looking up at the edge of the cavern as if his vision had penetrated the chamber to the end of the hole, "what we have to do is to open up this mysterious place for the leader." ”

The commander shook his head, he was just making his own opinion, in this mission, the doctor was the one with the highest authority.

There was another tooth-wrenching sound, but that was just the beginning, followed by a metal crash.

Although the doctor said righteous words, he was already a little unable to stand, and swallowed from time to time. He didn't know where the U-boat could go.

In fact, the commander also knew in his heart that they had no way to retreat at all, this hole was big inside and small outside, but the so-called big was only enough for it to go along, and there was not enough space for the U-boat to turn around, and they couldn't reverse it anyway.

They can only move forward, only forward.

The sonar still did not send an endless echo, the depth had almost reached the design depth, and the U-boat was now under the maximum pressure that the engineers could promise, how much and how long it could last, even the most senior experts of the Germania shipyard could not give a definite answer.

Yikes!

At this moment, a powerful jet of water suddenly began to erupt from the flange of a pipe, although the flow was not large, but the pressure was extremely amazing.

It is the discharge pipe of the toilet, and in order to discharge the filth under the water without allowing the seawater to pour in, it must go through multiple pipes and valves. And it is this sewage pipe that is most likely to leak under pressure on the U-boat.

At this time, a ball valve on the pipeline has been opened by a huge water pressure, and the flange connection simply cannot withstand such a large pressure.

I don't know why, although they are panicked, but everyone is not too stunned, the leakage is in their hearts, and they already have an expectation in their hearts, and it is only the best expectation.

The nearest chief engineer immediately re-imprisoned the valve, and in just a few seconds, a lot of water had been deposited on the ground, but there were still faint drips of water at the flange.

This valve can't hold out for too long.

The commander no longer looked at the manometer, the red pointer had turned to the end of the stroke, and had even crossed the range, and it was impossible to show the correct indication at all.

"You say, God will open his door and let us in?" said the doctor, rubbing Brody's hair and looking him in the eye.

"Are we going to die?" Brody replied.

"If God doesn't welcome us, then we're probably going to die. ”

The sound of the submarine's hull getting louder and louder, the crunch of a steel plate breaking shook everyone's heartstrings.

The submarine suddenly shuddered, and the entire hull fell out in one direction, and several people all fell to the ground and turned into rolling hoists, and the commander reacted extremely quickly and immediately rushed to the auxiliary steering wheel.

"What happened?"

"Engine No. 2 is stopped!" the chief engineer cursed, busily working in the small space between the two diesels, trying to get the diesels running again.

The uneven thrust undoubtedly increased the force on the submarine, and the deformation of the pressure chamber could be felt almost in the cabin, and it was very likely that the pressure chamber would completely rupture in the next second.

"Give up engine No. 2 and make every effort to keep No. 1 running," the commander said, holding the steering wheel with both hands, adjusting the rudder to balance the uneven thrust caused by the operation of a single engine.

For U-boats, the depth has really reached its limit now, some of the instruments have begun to malfunction, and even the sonar picture has begun to flicker.

"God, don't you have the courage to let me see you?" the doctor looked up at the lamp overhead, and just half a minute ago, it had shone violently for a few moments, and then it had gone completely black.

"What is this?" the sonarist's exclamation drew the attention of those who had almost given up on treatment, and the doctor ran over in two or three steps, "What did you find?"

"Gone, they're gone!" he shouted, a little incoherent.

"Calm down, soldier!" the doctor grabbed him by the collar, "tell me what you found!"

"The borders, the ones that have always surrounded us, completely disappeared between the probing intervals. ”

The doctor understood, staring at the refreshing sonar image, and there was nothing around except for the center point that indicated the submarine itself.

The doctor was stunned for a moment, he didn't think about what was going on for a while, he actually had the same thing in his mind as the commander thought

As a result, could it be that this submarine has really come to another unknown space now?

"Commander, stop now!" the doctor had a flash of inspiration, and suddenly remembered something, and he ran back to where he was and pulled the periscope down.

Sure enough, although the periscope was still very dim and barely visible, it was no longer like the one that had just entered the cave without any light.

He turned the periscope and looked at the back of the submarine, it was a familiar inky black, it seemed that they had driven out of the damn cave, and the reason the sonar had not given an end was not that it really had no end, but that at the end of the end, there was a large terrifying space.

The commander let go of the steering wheel, pulled down the aiming periscope, and after observing it for a while, he was equally stunned and speechless.

"Did we pass through this hole and come to a trench?" he said, looking at the doctor, half-inquiring, "I have the impression that the Ryukyu Islands are not so vast and deep. ”

The doctor shook his head, he didn't know what the hell it was, but it didn't look like a trench, otherwise how could the cave be explained.

Or, "Is there an obstacle above us?"

The sonar officer gave a definite reply, and the entire submarine was completely empty.

"Float!" said the doctor firmly.

"Are you sure?" the commander frowned, "we don't have any charts for this area right now, and it's very dangerous to rush up. ”

"Could it be worse for us to be in our current situation?" the doctor smiled, "and we have only one way to go." ”

The commander thought for a long time, but still sighed weakly and gave the order to drain the water.

The No. 1 diesel engine roared again, the water in the pressure chamber was rapidly discharged, and the submarine began to slowly float upwards, and the sonar crew stared wide-eyed, fully focused on the feedback from the sonar.

At this time, everyone was even more nervous and uneasy than the voyage in the cave just now, and in a completely unfamiliar environment, if anything above obscured and destroyed the shell, it was bound to be doomed.

Ten seconds, twenty seconds...... The manometer has returned to its range, and the water pressure on the outside has gradually returned to a safe range. But no one relaxed, everyone held on to the object that held them in place, ready to receive the impact.

The feeling of falling was sudden, and after a brief feeling of weightlessness, the whole submarine shook violently a few times, and even if he grabbed as much as he could, someone still hit the bulkhead.

"How could it be?" exclaimed the commander, this is clearly the situation that only occurs when a submarine is out of the water! He looked at the pressure gauge, only to find that the pointer was already pointing to zero!

How could it be that they were still at least 400 meters deep under the water a few seconds ago?

The doctor and the commander looked at each other, and both of them looked at the periscope very tacitly, and then they coincidentally grew their mouths in unison.

Yes, they were out of the water, and even though it was still pitch black as far as the eye could see, the faint light reflected from the surface of the water indicated that they were indeed on the surface of the water now.

What is this?

PS. Once again, the periscope of the submarine cannot be used in water depths of more than fifteen meters, and there are no searchlights oh, art "upgrades." ”