She returned to school in the afternoon to prepare for tomorrow's survey.

At about 7 o'clock in the morning, Sudi's commander stopped downstairs in the laboratory building of the University of Petroleum. After packing up, the two planned to rush to the foot of the house by 3 p.m.

In the middle of August, the hottest time of the year, the two were not willing to rest, took turns to drive, and the car did not stop, except for a refueling halfway and a trip to the toilet, the two did not get out of the car. On the one hand, it's too hot; On the other hand, and most importantly, the two are eager to unravel this long-lingering mystery.

Ju County, southeast of Shandong, the place where Dongyi Chiyou rises. Xia belongs to the Ju tribe, Shang is the country of Gumu, the Zhou Dynasty has Juzi divided here, built the country of Ju, and Lu, Qi, Yue and so on for hundreds of years, although the country is small, but twice the country in danger between the two times, the rejection of the barbarian more than a thousand miles away, the Union Lu Gong under the ancient ginkgo tree!

Although the dynasties changed after the Han Dynasty, Ju as a place name has survived to this day, Ju culture has survived through 5,000 years of culture, and Qi and Lu culture are called the three major cultures of Shandong. Tao Wen, who made Chen Hui and Su Di dream, excavate the Lingyang riverbed here.

At one o'clock in the afternoon, the commander was already driving on Ginkgo Avenue in Juxian County, passing through the city from west to east. There was a thunderstorm at noon, and the air was still filled with the smell of earth, and the declining cumulonimbus clouds mixed with muffled thunder receded towards the southern sky, but the northern sky was blue and dazzling!

In front of the field of vision is the houses that are close in front of you but out of reach. Walking through the city, rows of reinforced concrete buildings sandwich the thin buildings in the middle, and also erase most of the eastern skyline. When the commander approached the west bank of the Shu River, his vision suddenly opened up, and the low hills around him formed a welcoming array, and he rushed directly in front of him, and the ridges of the mountains were clearly visible, and even the trees in the mountains seemed to be able to see the appearance. The black bands are interspersed with light brown rocks.

"Sudi, aren't you tired, why don't we rest on the embankment for a while."

"Okay, I have that idea too."

"Ever feel scared? The mountain was in front of me, and suddenly I didn't want to do anything, for fear that we would be in vain, and even more afraid that it would be a trap. Sudi stared at the house, a little remorse in her eyes.

"I'm scared too! Nothing is a good thing, and if you are afraid, you are afraid that something bad will happen. ”

The words were a little heavy, and the two of them were silent for a moment.

"This scenery is really good, the ancients did not lie to us, you look at this water and this mountain, you should be happy in time, Xingle is not only eating, drinking, prostitution, gambling, smoking, spiritual satisfaction is more important. The confusion between the two of us is solved by Xingle. So don't jerk at the door. Why don't we sleep in the car for a while? Relax? "Sudi is quick enough to excuse herself, which is often a quality that a leader should have.

"You sleep, I'll just take care of my spirits. But this engine is just running? ”

"Hey, it doesn't work if you don't turn on the air conditioner. It doesn't cost you money, you're hypocritical. Wake me up half an hour later. ”

I don't know if Sudy is really relieved or pretending to ease his emotions, he lowered the driver's seat and really fell asleep. Xi Jue also lowered the co-pilot's seat, just closed his eyes, remembered that when he was studying in Juxian No. 4 Middle School, he stared at the house from the window on the east side of the dormitory corridor countless times, and remembered that he and his father rode a motorcycle to the house, and now his parents live in the countryside not far to the south, I don't know what the second elder is doing now, maybe he is also looking at this mountain.

remembered that during the first college entrance examination, he agreed with his confidante Orange to visit the house together after the college entrance examination. Who would have thought that Juzi was admitted to a 211 college, but Xun Xuan couldn't even see Sun Shan. Ashamed of his feelings, he broke the appointment. Now the orange has long been a mother, but I don't know if I am happy, whether I am still willing to meet together to visit the house......

"Yo, Dr. Li, don't you sleep? Isn't there still a sacred mission to wake me up? Why are you still asleep? "Who knows if Sudi fell asleep just now, but the time is very accurate, just half an hour.

"It's good to wake up, then let's go." There are no superfluous words.

"Well, just look at it!" Sudy turns on the mode of teasing the boring child.

It didn't take them ten minutes to reach the foot of the hill on the west side of the house.

From the west side of the view of the house building, can not see the peculiarity, because the altitude is only more than 450 meters, the west side platform is higher, can not experience the majestic magnificence of the mountain, it seems that from the west side of the view of the house is suitable for distant view.

It was around 3 p.m., and the earth was still scorching from the sun, and Sudy and Sudy didn't plan to avoid the hour, but wanted to enjoy it.

The two of them fly the drone and find the best equipment placement point.

"The whole mountain is in a north-south direction, and the north and south are longer, there is a village on the north side, to prevent onlookers, it is placed on the platform halfway up the mountainside, the south side is the cemetery, the equipment can be placed on the road to the cemetery, the west side is placed in the parking position, the east side is placed to receive the equipment, pay attention to the recording height when arranging, we first arrange the north side, and then the west and south in turn, and arrange the sound waves on the east side to receive sound waves, and determine whether the mountain is hollow through the subtle changes produced when the sound waves pass through different media."

"Dr. Lee, Sudi obeys. I'll carry the equipment and go to the mountainside platform on the north side first. ”

In about an hour, the wave transmitting equipment on the north, west and south sides was ready. The two of them drove to the east side. From the east side, there is indeed a formation in the house building, which can be said to be a thousand thousand miles of walls, and the strange stones and pines on the cliff are all over. Magnificent, magnificent!

After the installation of the receiving equipment, the remote control of the sonic wave transmission was turned on. The device shows that the data is being received......

After receiving the sound signal, it takes more than 10 minutes to process the soundwave signal, and the data is graphically graphed to intuitively reflect the structure of the mountain.

After the data was collected, she took out the memory and connected it to the laptop.

"Sudy, I'll get in the car and analyze the data, and you pack up the equipment."

"No problem, you are busy in the car, and the instruments in the east, west, north and south directions will be handed over to me."

The commander went around the house again, and Su Di put all his heart into data processing, while Su Di went up and down, back and forth to store the equipment that had been arranged before, and returned to the cab, where he found that he was still staring at the screen, looking nervous. As a layman, Sudi didn't dare to disturb, just sat quietly on the sidelines, waiting for the result.

"I repeated the analysis several times, and there was a set of data that I couldn't understand. Unable to match any known substance. First of all, I'm sure that the mountain is not hollow, but there is a substance in the middle of the mountain, and when the 900MHz wave passes through, the velocity is abnormally low, so low that there is no previous record to match, and there is no reflection, and the Hilbert product fails. Dr. Thee pushed the notebook in front of Sudy.

"Our guess was right!" Sudy was stunned.

"We're only half right, to be exact, and the anomaly is solid, but the material composition is different from that of rock."

"This is evil, can you deduce the shape of the anomalous area?"

"Crescent! This should not be a coincidence. ”