Admiral Middle Age

What Shi Linyao placed at the entrance of the cave was a passive sonar receiver—active sonar needs to continuously emit sound waves, which is easy to be found; passive sonar is actually equivalent to a waterproof microphone, but the sensitivity is slightly higher. Higher, you can determine the external situation by accepting underwater sounds.

Previously, it was estimated that for some unknown reason, the mysterious person picked up the sonar receiver that Shi Linyao put down from the sea. The sound transmission capacity of air is hundreds or thousands of times smaller than that of sea water. The diaphragm of the sound cannot feel the vibration of this frequency, and the sonar receiver will naturally show that it cannot receive the sound.

There is a wireless transmitter on the sonar receiver. Through this wireless transmitter, Shi Linyao receives the seabed sound signal felt by the sonar receiver—that is to say, Shi Linyao made a large underwater Bluetooth headset to receive sonar signals.

But now the sonar receiver can't receive the sound, so naturally there won't be any signal transmitted to this side, and the sound can't be received here suddenly. First impression: the sonar receiver is broken.

The sonar receiver placed at the door of the house was destroyed. This is a sign that someone has touched the door of the house. Therefore, the action of the mysterious figure for some unknown reason shocked Shi Linyao.

Shi Linyao, who had just returned with a Lexington, immediately felt that something was wrong. After a preliminary reflection, she thought that she was on the way back with Lexington, just like Katyusha before. I didn't notice, and then I was followed by someone, and I was touched all the way to the door.

After all, Katyusha has learned from the past, and now on this mysterious planet with ship girls, it is not known which ship girls have special skills that I don't know, and can track me outside my detection range.

Therefore, the possibility of being followed and blocking the door is entirely possible!

Be vigilant, Shi Linyao, who felt that something was wrong, immediately made battle preparations according to the worst situation and notified everyone of the situation, and gave Katyusha a batch of new powerful ammunition, so that the senior with the most combat experience in the fleet She set off first to detect the specific situation of the outside world, and even allowed her to open fire freely; ordered England to start quickly, and even prepared for the worst, asking her to fix the admiral on the seat to prevent him from being injured by violent shaking; After preparing for the injury of some people, Ark Peace was notified to take the Taiho helicopter and rush to assemble.

Cologne took good care of the admiral, and Santiago assisted England and prepared for air defense.

England's 1130 close-in anti-aircraft guns are ready, fifty rounds of magazines are ready, waiting for orders, ready for fast loading, and ready for full bomb launch.

Then...the engine is on standby, the torpedo is loaded, the launch tube is filled with water, the front cover is opened, the active sonar is silenced, the passive sonar is turned on, and the next...

The hull that was parked at the entrance of the cave to guard against Lexington, at this time, unexpectedly received the signal from the passive sonar that was placed at the entrance of the cave before, and the location...is actually on the mountain not far from the cave. Side... Judging from the strength of the received signal, the distance from the signal transmitter is less than five miles...

Well, the water tank is filled with water, the hull sinks, and Katyusha, who has walked out of the island along the underwater exit, is notified to be alert; the active sonar is turned on, and the sonar signal is sent in the direction of the signal transmitter...

The wireless signal transmitter indicates the direction, and the returned active sonar signal shows that there is another big cave next to the cave where it is now...

Between the two caves, there is an underwater passage. Sonar shows that the entrance of this waterway is quite hidden. The waterway is winding and winding, and there are several turns in the middle...

And the sonar receiver that was put down before is on the shore of that underwater cave...

Well, based on the above situation, it can be confirmed that the passive sonar receiver is now safe, it is in another cave, and this cave is next to the current cave, and there is a waterway connecting the two caves , the waterway twists and turns, but there is no ... 'trace' of any activity.

That is, someone moved that sonar receiver into a cave next door, and then... disappeared.

Perhaps, he went ashore and left.

Perhaps...the sonar receiver was used as bait, but the 'man' lay in ambush beside him.

However, judging from the whereabouts of 'her' before, and the way of returning a builder after taking the supplies, the possibility of the second option is not great.

That is to say, for some unknown reason, this mysterious figure picked up the passive sonar receiver that was supposed to be placed at the entrance of the cave and changed it to another place.

Although I don't know what "she" means, but judging from the previous performance: "she" should not have any malicious intentions.

Maybe, just for fun looking at that sonar receiver?

In order to reduce the chance of being discovered, Shi Linyao made the sonar receiver into the shape of a sea turtle, installed power equipment, and set a cruise route. Originally, he wanted to see a sea turtle swimming around on the bottom of the sea. , should not attract the attention of others.Can better increase concealment.

But I didn't expect that before I officially started working, I would...

Well, would have thought it was an accident.

In the end, who knows, it turned out to be a false alarm!

This is also good news.

The sonar placed at the entrance of the cave suddenly stopped working. I thought it was something serious, but it turned out to be moved to another cave.

Judging from the situation discovered in the recent period, the only one who can do this is the mysterious man who held the builder and replaced Lin Jianguo and the others with a batch of supplies.

Judging from the way of behavior, that person came one step ahead of Lin Jianguo and the others, knowing that she was on the island, but could not find her. They did not show any malice towards Lin Jianguo and the others. After all, it should be the business that lost or earned, that mysterious 'person'.There shouldn't be much malice towards them.

This is really good news! ?

"Hey, by the way, are you sure it's that mysterious person?" Lin Jianguo was still a little worried, but now he just knew that someone had taken the sonar receiver away.

But whether it was actually taken by the person who came to the island first and was quite friendly to them... He wanted to confirm again.

If there is one, there are two. There is a mysterious person who behaves quite friendly and can exchange the builder for resources. There is no guarantee that there will be no second one.

I have always known that someone is there, but I have never found any trace of the other party. Who knows how many of them there are?

"This..." The little red-haired Santiago and the little yellow-haired Yingying looked at each other. They understood Lin Jianguo's worry, but neither dared to make a guarantee: "Report to the admiral, we can't make a guarantee yet."

"Then... that means you can't relax your vigilance yet?" Although he was a bit unwilling, the fact is that if he hastily relaxed his vigilance, if something unexpected happened, it would be too late to regret it.

"You can listen to it and see!" Kelong frowned and stood tightly beside Lin Jianguo. She didn't like the current situation too much.

It's just... pointing to the console next to Santiago: "Isn't your sonar device the same model as the big sister's head? It can receive the sonar frequency of the big sister's head, and let the big sister's head turn on the sonar frequency." The radio frequency is sent over, you can listen to it and see if you can hear who is the one who took the sonar?"

"Okay, then I'll let the voice out, and we'll compare and see who can recognize who this person is first." England's eyes lit up, and she didn't see any movement. The console next to the little red-haired Santiago Suddenly the light was bright, and the lights that dazzled outsiders and didn't know what they were used for were automatically switched on, and then flashed colorfully: "But maybe it may not be useful, the one on the big sister's head Sonar is a special sonar for submarines, it is mainly used for...there is sound?!"

England directly connected the sound received by the sonar receiver and the sound from the radio to the speaker in the command room, and played it directly.All about this mysterious person. She knows that the big guy is still very interested. She didn't have the opportunity before, but now that she has the chance, she simply asks the admiral to listen to the big guy, and see who can hear this guy first. What kind of a person.

"Hey, tell me, why would she think of moving such a bug into her home?" Santiago couldn't figure it out, who was it?She even thought about removing a sonar receiver. She didn't know that doing so would be equivalent to installing a bug in her own home, so that others could hear any movement in the future?

"Who knows? I haven't actually seen it before." England couldn't understand why someone would do this: "I heard from the elder sister that the sonar receiver this time seems to be made according to bionics, and it is quite concealed. , probably that person didn't expect that what she took away would be a sonar receiver."

Shi Linyao didn't tell them that the sonar receiver was made in the shape of a sea turtle, and she was also afraid that the two brats would have different ideas about the sonar receiver.She only told them that this time the sonar receiver was manufactured according to simulation, and it was relatively concealed.

Since we want everyone to compete together, it can't be too unfair, so England directly turned the volume of the player to the highest, so that if anyone says that they can't hear clearly, it's none of my business .

Just as the speakers were connected, there was a burst of crackling noise first, followed by a piercing whistling sound, which was so loud that everyone frowned.

Santiago took off the high-sensitivity earphones on his ears, and after making sure he was not deaf, he gave England a hard look.

Originally, she secretly put on this earphone, thinking that she could take advantage of this equipment to hear more clearly and hear some different information from others.

Unexpectedly, England, who was only thinking about fairness, turned the volume to the maximum as soon as it was turned on.It made her fall out of the chair almost without being shaken by the noise coming from her ears.