The weakening of the fire indicates that the air pressure inside the tomb is decreasing. The principle is the same as the biogas tanks widely used in rural areas. The air pressure inside the tomb that has been closed for a long time is much greater than that outside. Tomb No. 1, Changsha is one of the more famous fire pit tombs. The combustible gases sprayed out at that time were very high, and the water that was poured out was splashed out. After ignition, the flames sprayed out were as high as half a meter. The flames sprayed out from Tomb No. 1, Mawangdui, burned for three days and three nights, and the flames in the tomb of Song Huizong burned for ten days before they weakened. This shows the size of the underground tomb here.

Of course, Zhang Keming knew what the weakening of the fire meant, so he immediately said to the intercom, "We'll be there soon." Afterwards, he said to Liu Yue and Tang Feng, "Go and have a look."

The three people came to the deep pit located at the outer edge of the trapezoidal excavation surface. Through Zhang Keming's introduction, Tang Feng roughly learned about the process of discovering this thieving hole. On the third day of the excavation, archaeologists discovered a vertically downward deep well. The well was very deep and could not be dug for a long time. So the archaeologists transferred large machinery, and dug it to a depth of 150 meters after digging, forming the big pit in front of Tang Feng.

After seeing the diameter of the original horizontal pit, Tang Feng said affirmatively: "This should be a large-scale scale carried out after the Republic of China. Organized official thieves, the excavation tools and methods used were not in ancient ways. Ordinary civil thieves could not be so blatant."

This method of digging holes is different from the traditional method of digging holes. It is first digging deep vertically downwards, and then digging horizontally. When digging horizontally, in order to prevent landslides, tomb robbers have learned from the method of supporting the wood when coal miners digging coal. Another advantage of using this method is to prevent sand accumulation tombs.

Sand-storage tombs are commonly known as quicksand tombs, and they are also the type of tombs that are the most troublesome and afraid of tombs. When backfilling, quicksand tombs do not use raw soil, but fried fine sand. When the sand accumulates to a certain position and thickness, it is buried with soil and tamps around it. Quicksand tombs have a very lethal power to tomb robbers. Once dug, fine sand will pour into the hole like water to suffocate the tomb robbers and let the tomb robbers suffocate to death. In dealing with quicksand tombs, tomb robbers will use bamboo and wooden boards to cover the quicksand on them while using wooden support.

On the bottom of the pit, a few dark blue and smokeless flames were spraying out weakly. Liu Yue said: "Don't look at the flames nowadays, they look soft and weak. At the beginning, the flames sprayed out were more than two meters long."

Zhang Keming said: "For safety reasons, we decided to burn all the combustible gases first."

Tang Feng asked Zhang Keming: "Since the imperial tomb of Emperor Huizong of Song had been excavated before, the combustible gas should have been released, why are there so many now?"

Zhang Keming said: "I guess the tomb robbers at that time had an accident during the tomb robbery process, which caused a small collapse in the entire robbery hole. As for why others did not continue to excavate, it is unknown. It may be because of a major change in the current situation."

Tang Feng felt that Zhang Keming's inference was very reasonable. This excavation formed a large well with a depth of 150 meters and a diameter of 3 meters. Such a large-scale excavation project requires a large number of manpower. Once an accident occurs, the consequences will be very serious. It is certain that someone will die. After losing a large amount of manpower, the tomb robber actually buried the wellhead at will and left. Some major changes must have occurred.

Zhang Keming continued, "After the incident, the tomb robbers did not give up on the tomb robbery, but buried the wellhead, which means they were ready to continue in the future. As a result, they did not come back once they went."

Tang Feng smiled and said, "Why do I think this is a tomb robbery conducted by the Kuomintang army? I guess I went directly to Taiwan later and didn't have the chance to come back."

Zhang Keming said: "There is only this understanding. When this horizontal hole was dug here, a large area of ​​collapse occurred, and then combustible gas overflowed, indicating that the collapse of the hole was not very serious and it was empty inside."

Tang Feng said: "Professor Zhang, do you think there is such a possibility? The tomb robbers used open flame lighting when excavating. After the tomb was opened, a small-scale explosion occurred. Because the landslide caused by the explosion blocked the hole, the combustible gas was not completely released."

"There is such a possibility." Zhang Keming said: "No matter what, it is a good thing to have not been stolen. It is true that archaeology originated from tomb robbers. It is ridiculous to think about it. Since the day I was engaged in archaeological work, I have been following the footsteps of tomb robbers. Over the years, I have never encountered a tomb without a robber."

Whether it is an archaeologist or a tomb robber, the most depressing thing that made them feel was working hard for a long time. When they opened the tomb, they had been visited by someone. Tang Feng remembered a past story that their old man had told him. When his grandfather opened a tomb, the property inside had been looted. Only a copper axe was left on the ground, and the useless ribs were also meat, so he took the copper axe home. A few years later, he met another tomb robber from the tomb robber family. When he saw the copper axe, he said it was their family. Of course, Grandpa Tang Feng's grandfather did not believe it. As a result, the mark on the axe was clearly stated, which was their family. Tang Feng asked Zhang Keming: "Professor Zhang, how many tombs have you encountered the most robbery holes?"

Zhang Keming smiled and said, "That's not ordinary. There is one thing I will never forget. It was a tomb that competed with tomb builders in ancient and modern times. "Then Zhang Keming talked about what he saw and heard. In May 2005, an ancient tomb in Spring and Autumn was discovered in Guozhuang, Shangcai County, Zhumadian City, Henan Province. The archaeological department immediately carried out a large-scale archaeological excavation activity on it. I didn't know it, but I was shocked to see that there were as many as 17 large and small holes found on the scene. Among them, the earliest hole was dug in the Warring States Period. When it was dug 3 meters outside the north entrance of the tomb chamber, the tomb robber encountered quicksand and was forced to stop digging. There were 7 holes excavated in the Eastern Han Dynasty. The most powerful hole in the Eastern Han Dynasty seriously damaged the structure of the tomb chamber.

Tomb robbers adopted the method of robbing the eastern part of the tomb chamber, and the hole penetrated the thick curtain wall and reached the near the coffin. When the tomb robber was about to become a slaughter, the tomb robber accidentally touched the rolling stone mechanism, which caused the stone to collapse, and the tomb robbers themselves to be buried. At the same time, there are 9 modern robbing holes in this tomb. Otherwise, modern people are smart, they all used directional blasting, digging deep and then digging horizontally. The longest horizontal hole is 27 meters. After entering the tomb chamber, they used the method of setting up bamboo and wood alleyways to rob. In the end, they robbed the tomb tomb, but they robbed the tomb, but they did not steal the real coffin but the fake coffin designed by the tomb builder, and completely got the wrong direction. Because they touched the fake coffin, quicksand as thick as ten meters poured in, they had to retreat and leave.

Zhang Keming said: "Not to mention tomb robbers, we almost fell for a fool when we entered. The tomb builder not only repaired the fake coffin on the side of the main coffin, but also made a fake coffin directly above the main coffin. For the sake of reality, he also seriously placed many small burial objects in the fake coffin. If I was not mistaken, this tomb builder must have been very famous at that time. The anti-theft moves of the entire tomb were arranged one by one. If it weren't for us, God knows when this ancient tomb, which is almost 3,000 years old, would be left."

Liu Yue said: "Although this process is very difficult, the result is still good. It can survive 17 tomb robbers in nearly 3,000 years. This tomb builder is the number one architect in ancient and modern times."

Tang Feng smiled and said, "Why do I think this was built by Lu Ban?"

Zhang Keming smiled and shook his head. He said, "It shouldn't be that there are many talented people among the ancients. Their architectural concepts are often epoch-making, otherwise there would be no 'bridge strong' that could stand three times of blasting. Alas, let's not talk about this anymore, Mr. Tang, do you have any ideas now?"

Tang Feng said: "Now I can only use a stupid method. I will dig after the combustible gas is burned out and then look at the internal structure of the thieves. To ensure the integrity of the tomb chamber, I can only open the tomb door from the inside. By the way, Professor Zhang, I would like to ask you a question."

Zhang Keming said: "You ask directly, it doesn't matter."

"Why are there any other reasons why you don't enter the tomb from the main entrance?" Tang Feng looked at the busy staff around and asked Zhang Keming: "This archaeological excavation is unprecedented in terms of scale, personnel and technological equipment. I always feel that you have made it too formal."

Zhang Keming smiled and said, "I'm sorry, my answer just now is too fast. I can only tell you one thing now. This tomb is of great reference significance, and our goal is more than that."

Tang Feng nodded and said, "I understand."

Zhang Keming said to Liu Yue: "I didn't say anything."

Liu Yue smiled and said, "I heard nothing, either."

Although Zhang Keming did not say it clearly, Tang Feng already knew in his heart that the country was finally going to take action, and the time for excavating the Mausoleum of Qin Shihuang was not too far away.

Time flies quickly. In a blink of an eye, three days passed, and the combustible gas from the Imperial Mausoleum of Song Huizong finally burned out. Large-scale excavation along the thieves began quickly. As Tang Feng and his friends expected, small-scale collapses did occur, and there were signs of explosions. After three days of large-scale excavation, Liu Yue ran into Tang Feng's temporary residence. She said to Tang Feng: "A few highly decayed corpses were dug out just now, and they should be the tomb robbers at that time."

High output also means high risks. Tomb robbing is really a dangerous business. Tang Feng asked Liu Yue: "So, has the tomb wall been dug?"

Liu Yue nodded and said, "Yes, it is an irregular round hole with a diameter of about half a meter. It is so gloomy and terrifying. Professor Zhang said that there must be a mechanism to kill people."

The mechanism, explosion, landslide, several corpses, suddenly, the imperial tomb of Song Huizong became confusing and crises. Tang Feng said: "Let's go, let's go and have a look."
Chapter completed!