The fragments of the glass test tube were still lying on the ground, and the light cyan liquid contained in it was very viscous, sticking to the test tube rack support, because the room detected an abnormality, the air circulation system and the door were all locked and sealed, and the faint pungent smell was still smelling at this moment.

The shattered glass test tube is close to the side of the wall, closest to the lift shaft. But Professor Mosier circled around the pile of debris, his eyes getting brighter and brighter, as if he had found something of interest. He looked up at the middle of the elevator shaft through the thick walls and rock formations, and the basic guess had appeared in his mind.

"By the way, the ultrasonic oscillation machine in the laboratory base is started at full power, can it shatter these glass test tubes?"

"No, even if the safety device is removed and allowed to operate beyond the limit, it will not have the effect of shattering the glass. The performance of the machine itself limits it. In addition to assisting in the test, all the machinery and equipment in the laboratory base are under his debugging and management, and no one is more familiar with these machines than him, "Purchased from the Far Sea Commonwealth, subject to national control restrictions, in order to prevent being bought to disassemble and transform into weapons, so many data performance has strict requirements." The manufacturer is not a huge company, and this kind of thing should not be dared to do. ”

"That's it. But Professor Mosier nodded with satisfaction, "Next, help me retrieve the surveillance images in the tunnel from the analysis machine, and the time period is still five minutes before and after." Bennett, this matter is digested in the four of us, and we don't have to tell the people in the town. In addition, by the way, the storage of various materials in the laboratory base was counted, and many materials should reach the warning value in a few days. You categorize them and build a list. ”

"Got it. The man named Bennett nodded. He was a researcher here, but Professor Mosier was both his boss and his teacher.

"Isn't there a new group of protection and caretakers in the town's warehouse?" Professor Mosier answered, walking out of the room with Bennett, "Every day or two, let each of them deliver the corresponding supplies separately. This is something that has been tacitly agreed upon, and we can help these young people a little bit. However, there is one other thing that I need you to help me prepare, and it is Zagavar you. ”

The thin man heard Professor Mosier call his name, obviously confused, followed by nervousness, he nodded, waiting for the rest of the conversation.

"You are most familiar with the machinery and equipment, and I want a kind of inspection machine. There are only two or three of them, and as long as you can get them, you can do them with the stuff used in the lab base. But Professor Mosier said slowly, "You should be very simple, a sound detector, the kind that usually measures the level of noise. But I need a wide range and exceptionally good sensitivity. The kind that can be captured by both low sound and ultrasound. It doesn't need to be detected to make a 'drip' sound, silently leave a record, or send out a vibration feedback. ”

"Do you have any difficulties?"

Zagarwal was lost in thought, and after a while, he raised his head, "It may be necessary to disassemble the monitoring machines of the two shock chambers, and they will not be able to recover after that." For other widgets, you need to go to the nearest city to buy. It is easy to buy and are commonly used with some of the originals. ”

But Mosier nodded: "Bennett, wait for Zaghar to give you the list, and let the people in the town buy it on your behalf." ”

"How much time?" said Mosier, smiling even more as he turned his head to look at Zagavah.

"Three days. ”

"Well, Bennett, the time for a few people from the town's warehouse to deliver the supplies is set for three days.

、、、、、、

Finally realized what Adolf meant by leisure. In the morning, Kasia returned from a stealthy patrol around the town, sat down in a chair and sighed. It's like changing your home, the only difference is that your freedom is restricted.

The dozen or so books he brought were finished in less than two or three days, and Kasia already had plans to read them a second time. After all, there was no follow-up to the detection event of two days ago, and everything was moving forward as usual, in this quiet and peaceful town. The map had been drawn, and based on the number of steps taken, Kasia had calculated that the laboratory base was a little more than fourteen kilometers away from the small building, under the edge of the mountains.

After checking the map, there was no record of mining minerals around, and Kasia guessed that a large part of the underground laboratory base was built by artificial secret excavation, but there should also be some influence of natural topography, otherwise the depth of more than 300 meters would indeed consume a lot of manpower and material resources.

It doesn't have much to do with himself, the four people here are like air to each other, and no one wants to take the initiative to talk, so the interaction of information is completely incomprehensible. Adolf also only explained that when he came here during the mission, he would slowly understand that three days had passed, and Kasia had not seen anything.

It didn't affect Kasia's state either, and everything went according to the set time. In addition to the basic training of some simple movements, in the last day or two, Kasia finally picked up the study and practice of high-frequency sound waves that he had never really carried out before.

The sudden incident during the detection a few days ago really surprised Kasia, it was like a hidden surprise, and then attracted his great attention. I didn't expect that after the surgery entered the third stage, it would be so easy to control myself. The simple bunching of high-frequency sound waves was a problem for Kasia before. In the past, sound waves could only be evenly dispersed in all directions, so if you want to concentrate energy, you have to constantly increase the capacity of your throat. But at this time, it is much simpler, and after it has directionality, the power has increased significantly under the reduction of consumption.

After recalling all the theoretical information in his head, Kasia finally chose the direction of mass destruction. The detection of sound wave pulses is enough to use, thinking that the enemy will become more and more tricky after it, relying on high-frequency sound waves in the case of information asymmetry, there is a chance to destroy the opponent's auditory system, as long as there is less than a second to cause the enemy's body to temporarily lose balance, this is an absolutely fatal opportunity for the enemy.

And the characteristics of high-frequency sound waves themselves, when the power and frequency are sufficient, the shattering of glass is only the initial power. After that, it can become an invisible means of attack in itself, which can make the air carry a great pressure, and after forming a linear constriction, it can become a shock beam that suddenly explodes from extremely compressed air.

At noon the next day, while Kasia was in the room doing basic exercises, there was a sound from the communication machine. The other three also felt it. When they came to the hall, the others arrived almost at the same time. As the captain, No. 1 naturally walked over and picked up the listening board.

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