Ye Zi was willing to cooperate with him, which undoubtedly helped Xia Yu a lot, but it was not good to just throw Ye Zi here and let her think crankily alone, so Xia Yu still prepared some things for Ye Zi to do.

After taking a few steps to the monitoring station, Xia Yu picked out a wrench from the tools scattered on the ground, and then turned back, looking at the teary and hazy leaves, Xia Yu said very seriously: "Yezi, we need to attract the attention of the outside now, only by attracting the attention of other ships, we can be saved, but I can't be busy alone, I need your help, can you help me do something?" ”

As soon as he heard that he might be saved, although Ye Zi was still a little frightened, he forced himself to calm down and looked at Xia Yu, although he was a little hesitant, he still took the big wrench handed over by Xia Yu, and then nodded and said, "I'll do my best, what do you want me to do?" ”

"It's not too hard." Xia Yu smiled at Ye Zi, then picked up the big wrench in his hand, and led Ye Zi not far ahead, in front of the exposed pipe in the corner of the bulkhead, Xia Yu signaled Ye Zi to pay attention, and while "dangdang", he beat on the pipe rhythmically, and said to Ye Zi: "I want you to tap this steel pipe according to this rhythm, and then keep repeating it." ”

"Oh" means that he understood Xia Yu's words, although Ye Zi didn't understand why he did this, he still took the wrench handed over by Xia Yu, and began to learn Xia Yu's beating method just now, and tinkled on the pipe. The first few strokes were similar, but after a few more knocks, Ye Zi completely forgot about Xia Yu's percussion rhythm just now.

Looking at Xia Yu with an aggrieved face, Ye Zi said in embarrassment: "I can't remember ......"

Xia Yu was helpless, he had tried his best to shorten the content of this Morse code, in this situation of not being able to directly contact the outside world, Xia Yu could only choose this type of tapping method of different lengths, so that the Morse code could be sent by sound waves to inform Sù that the location of the submarine and his own identity information could be patrolling around the Chinese ship. Because he has other things to do, he can only let Ye Zi, who has not undergone relevant training, do this thing, but it seems that this is still very reluctant for Ye Zi.

It is necessary to get in touch with the outside world, or at least to attract the attention of the outside world. Xia Yu gritted his teeth and said to Ye Zi: "Ye Zi, don't worry about the rhythm or anything, you just need to hit this steel pipe hard, the louder the better, understand?" ”

"Oh." Ye Zi nodded, if it was just such a simple thing, Ye Zi could still do it alone, so after answering Xia Yu's voice, Ye Zi raised the big wrench with both hands, and then aimed hard at the pipe is stick and knocked it down.

With the sound of "dang", the sound echoed in the huge cabin at the same time, through the vibrating metal pipe, this crisp sound was also directly transmitted to the entire submarine, and then sent from the hull of the ship to the surrounding sea water.

"Well done, just do it, don't stop." Xia Yu was overjoyed, then pointed to the door of a cabin and said to Ye Zi: "I'm going over there to do something, just knock on this steel pipe here, I'll keep an eye on you, don't worry." ”

Ye Zi, who had been praised by Xia Yu, let out a "hmm", raised the big wrench again, and knocked it hard against the pipe. Seeing that Ye Zi had finally recovered to normal, Xia Yu didn't ink, and immediately flashed directly into the electromechanical room. He still has a lot to do, although the knocking of the leaves may attract the attention of the outside world, but the range that this intensity of sound waves can convey is not wide, so for the sake of insurance, Xia Yu plans to use his hands and feet in the electromechanical room.

Through the annotation of the maintenance atlas, Xia Yu knows that some circuit settings can be affected in the electromechanical room, if done well, Xia Yu can even launch the active sonar emission base array at the tail of the submarine in the mechanical and electrical room in a manual way, but because the mechanical and electrical room does not have a complete set of sonar work equipment, Xia Yu can only release the sonar base array at most, and cannot receive the feedback information, so Xia Yu is unable to know whether he has been discovered by other ships. But it doesn't matter anymore, as long as the active sonar system can work, the intensity of the sound waves emitted by the sonar transducer of the active sonar system should be enough to attract the attention of other ships in the vicinity, after all, China's coast is not undefended.

Xia Yu, who disassembled the control panel of the electromechanical room, referred to the maintenance atlas that had been written down in his mind, and while looking at various annotations, he studied how to affect the operation of the submarine. With the help of the starry sky, Xia Yu still groped for a short circuit in some of the submarine's facilities, causing a certain section of the cabin or equipment to suddenly lose power supply or something like that.

However, submarines usually have a set of backup power supply can be applied, considering various circumstances, Xia Yu also made a rough intervention on the resistor or other power supply devices, and some circuit boards were also deliberately broken down by Xia Yu's sudden increase in voltage and current, which directly caused irreversible damage.

The command tower of the submarine, since the sergeant major pulled up the warning light, has fallen into a nervous state, and when the soldiers sent down to support again gave feedback on the latest situation, the bearded captain immediately flew into a rage, although he immediately issued an order to arrest and even kill, but the damaged hatch could not be opened at all, especially when Xia Yu ripped off the wiring in the control plate, and threw it into the locked cabin, the situation even evolved to the point that even if he wanted to repair it, there was no available wire.

Even if it was intended to be forcibly opened, the damaged hydraulic pump and ejector rod were stuck and could not move at all, so they could only think of other ways to see if they could open the hatch, but this was not a job that could be completed in a short period of time, so as Xia Yu expected, others could not get through the two hatches that were locked by themselves, at least for a short time, they and Ye Zi were still safe.

Although thinking so, Xia Yu still accelerated his speed of action, and after a while, Xia Yu completed the preparations, and after connecting the two exposed wires together, the active sonar base array locked on the tail of the submarine was launched silently and dragged behind the submarine.

"Damn, our active sonar was launched." The sonar man suddenly jumped up in fright, the sudden work of the active sonar array was completely beyond his expectations, the knocking of the pipe before was enough for him to be busy, emitting bubbles and so on to hinder and slow down the transmission range of sound waves, which could be very far away from being discovered by other ships, although it was still under control, but it was already quite dangerous, but if the active sonar array started to work, according to the position of other ships around, it was 100% certain that the submarine would be discovered.

Just when the sonar crew was very nervous, the active sonar array did not start working, but was dragged by the submarine and wandered in the water, the sonar crew secretly breathed a sigh of relief and wanted to take back the sonar array, but after pressing the recovery button, there was no response, and the sonar crew couldn't help but get nervous again.