In the command tower of the nuclear submarine, there was silence at the moment, and all the people unconsciously relaxed their breathing, stopped their movements, and carefully felt the surrounding situation, although in fact no one could feel anything except the sonar.

The sonar crew is also carefully listening to the passive sonar information received, the most obvious is undoubtedly the active sonar signal sent by the 139 ship, and a hint of water bubbles, which is the sound of the propellers of the Type 039A submarine stirring in the water.

Originally, according to the design requirements, when the propeller is running in the water, it cannot produce bubbles, because this can reduce the noise of the propeller to the greatest extent, but because of the limitations of metallurgical technology, the country is not able to manufacture the kind of propeller that does not produce bubbles under water, and can only minimize and control the generation and size of bubbles.

Although it still can't be perfect, compared with the previous old submarines, the 039A, that is, the Yuan-class submarine, still achieves the world-class level in terms of noise control. But 039A can't still keep the U.S. nuclear submarine hidden at such a close distance, but because the location of the nuclear submarine itself has a great impact on the work of the sonar system, the sonar officer on the nuclear submarine only knows that there is a submarine nearby, and he can't capture the specific location information of 039A, so he can only pay close attention to the situation around him, hoping not to be discovered.

The bearded captain's plan, the entire control tower is known, secretly waiting for the rescue of the USS George Washington aircraft carrier battle group, as long as it is not discovered during this period, the submarine can successfully complete the breakaway, everyone is quietly waiting for the final result, but no one thought that the two people in their consciousness who should be gradually falling into a coma at this moment are still alive and thinking about making trouble for this submarine.

According to the idea of the bearded captain, the entire No. 7 cabin was completely sealed and oxygen delivery stopped, because the No. 7 cabin itself stored oxygen, so it was a slow hypoxic process, which should not arouse the vigilance of the two people inside, so as to prevent them from desperately destroying the submarine and pulling everyone together to be buried together.

As long as it does not cause a violent reaction, then in the environment of gradual hypoxia, the people inside will become slow in thinking and slow down due to lack of oxygen, and finally fall into a coma due to lack of oxygen, which is a process that takes at least 15 minutes or more, and the bearded captain does not expect the two people inside to be directly unconscious, although the result is better, but obviously it cannot be done.

As long as their thinking becomes slow and confused, and in the case of a greatly reduced processing ability, even if they are awake for the time being, there will be no threat, and the bearded captain's plan has the possibility of success, which is one of the main reasons why the first mate agrees to this plan, I am afraid that no one will know better than the officers and men of the submarine what the hypoxia is all about. Medical staff may know what hypoxia will cause to the human body, but it is definitely not like submariners, who have to undergo training in an oxygen-deprived environment and experience the feeling of deep hypoxia.

The bearded man's plan can't be said to be wrong, after all, if it were an ordinary person, I'm afraid it would really be his way, but the problem is that Xia Yu is not an ordinary person, in Xia Yu's head, there is also a alien system, and the most important thing is that Xia Yu's body has been strengthened by this alien technology system as many as three times.

Dull? Xia Yu, who was extremely sensitive to the surrounding environment, suddenly felt that the air seemed to become a little dull, Ye Zi was still breathing normally, and there was nothing abnormal, but Xia Yu immediately became alert. In a submarine, the oxygen exchange equipment is one of the most important equipment, and it is absolutely impossible to stop working on the initiative, and the only thing that can be thought of is that the commander of the submarine has found a way to interrupt the oxygen supply to this compartment.

No wonder the submarine has been motionless since the strange sudden tilt and sinking of the submarine just now, Xia Yu once thought that this was a covert act in battle, and was ready to seize the opportunity to attack again, but he didn't expect that it was to let himself and Ye Zi fall into a coma unconsciously. In this way, Xia Yu can understand why the other party suddenly shut down the nuclear reactor, not only can interrupt the work of active sonar, but also can greatly reduce the noise and reduce the risk of being discovered.

Admiration is admiration, but now is not the time to admire, there is no oxygen, this is not a casual thing that can ignore the past, because for human beings, oxygen is the most basic substance needed for survival. In the absence of oxygen, ordinary people will die after less than ten minutes, and these ten minutes are basically in a coma, just like drowning, the best rescue time is within ten minutes, beyond this time period, basically it is impossible to save it.

Looking at the leaves who still didn't know, Xia Yu's heart sank, what should I do now? There are people outside the hatch on both sides, considering his previous violent methods, it is estimated that the door will be a dead end as soon as it is opened, but if you continue to stay in it, according to the oxygen storage capacity of this cabin, you can only hold on for half an hour at most, and then you and Ye can only lose the ability to move.

Not because there is no oxygen, but because of carbon dioxide poisoning. Although carbon dioxide itself is not toxic, but too high or too low concentration will affect the human body, dizziness, headache, chest tightness, and so on, these reactions are the initial carbon dioxide poisoning symptoms, once the surrounding carbon dioxide concentration continues to increase to a point that the human body can not accept, then there will be unconsciousness, and finally lead to death.

The concentration of carbon dioxide in the cabin will not immediately increase to the point where it can be fatal, but the results will be similar if it drags on for a long time, although it will not kill immediately, but if you lose the ability to act consciously, the consequences are obvious. Xia Yu's mind was spinning and he wanted to come up with an effective solution.

"Xia Yu, what are you doing?" Ye Zi asked suddenly.

"It's okay, I'm just thinking about it." Xia Yu glanced back at Ye Zi.

"I feel a little stuffy." Ye Zi's eyes widened, looking at Xia Yu a little pitifully.

"It's okay, this is a submarine, the enclosed space is a little stuffy." Xia Yu comforted the leaves, but his heart sank, and now even the leaves began to feel uncomfortable, which proved that the carbon dioxide concentration in this cabin began to be high. In such a closed, unventilated environment, as the two of them breathe, the concentration of carbon dioxide will only increase, and it cannot continue like this.

With a flash of light in his eyes, Xia Yu picked up the metal wrench on the floor and stood up suddenly, walked quickly to the pipe that had been knocked many times, picked up the wrench high, and then smashed it against the metal pipe.