Residents living in the Qiqihar Railway Station area rarely have the trouble of blocked sewers, so where does the wastewater of the residents here go? In the courtyard of the Qiqihar Ma Knife Factory, there is a cement building in the shape of a grain farm, which people habitually call the "big black bag". This big black bag has two entrances, one of which is a bottomless well. "Black bag" After being eroded by wind and rain, the exposed steel bars are crisscrossed. What is such a rough-skinned and thick-flesh thing used for? In fact, all this is not surprising. These are just a few "points" in the Qiqihar underground fortifications that have been discovered when the Japanese invaded China. The Adventure Group of Six Qiqihar City is located in the Songnen Plain. There are almost no geographical conditions on the ground that can be used as strategic defense and material reserves. As an important strategic base for the Japanese invasion of China to resist the former Soviet army, its military facilities must be hidden underground. Long-term commitment to research and attention to the issue of Japan's invasion of China brought together six people with the same eyes: Feng Wanjun, an expert on Japan; Xu Wenxiu, director of Qiqihar Workers' Cultural Palace; Tong Zhonghui, Qiqihar TV reporter; Liu Yiquan, veteran of the Anti-Japanese War Soldier; Fu Yonggui, collector of evidence of Japanese invasion of China; Liang Yingshi, chairman of Qiqihar Collection Association. In May 2000, a six-member group proposed to Yang Xin, Mayor of Qiqihar City, a proposal to develop underground fortifications for the Japanese invasion of China. Mayor Yang Xin immediately expressed his full support. People have long known that there are underground fortifications built by the Japanese invaders in Qiqihar, but they have never been discovered since Qiqihar was liberated in 1946. Based on Mayor Yang Xin's opinion, the six people began to check relevant information and investigate and interview people with knowledge of the matter. However, due to the age, the laborers who built the fortifications for the Japanese were nowhere to be found. After hard work, they found the entrances to five underground fortifications: Workers' Cultural Palace, Daheibao, glass factory, train station, and No. 2 Municipal Government Yard. On May 3, 2002, six people including Feng Wanjun, Tong Zhonghui, and Xu Wenxiu entered the tunnel from the entrance of the Cultural Palace with flashlights and candles in hand with the assistance of the Cultural Palace security personnel. Candles are used by six people to detect whether there is a lack of oxygen underground. Passing through three gentle platforms along the 1.9-meter-high and 1.5-meter-wide tunnel, after walking for about 30 meters, the first iron gate appeared in the tunnel, and the second iron gate appeared 10 meters apart. At 100 meters, the tunnel volume began to increase. At this time, the six people had passed seven iron gates. But soon, all six people felt dizziness and nausea to varying degrees, so they returned to the ground. During this investigation, it was deduced that the main entrance passage leads to the No. 2 Courtyard of the Municipal Government, thus confirming the claim that the No. 2 Courtyard of the Municipal Government was the former Japanese Military Police. The branch passage leads to the train station and "Big Black Bag". The total length of the tunnel is estimated to be about 20 kilometers. The Mystery of the "Big Black Bag" According to local elders, since the fall of Qiqihar in 1931, the Japanese Kwantung Army began to build underground fortifications here, so a large amount of earth began to be transported here using "Gulu Codes" (rail cars) emerged and gradually formed its current terrain. On top of it, there is a well-preserved Japanese military building. Because the appearance was originally black, people are accustomed to calling it the "big black bag". The "big black bag" is a cone with a diameter of about 30 meters and a reinforced concrete wall thickness of about 1.75 meters. Based on the geographical location and appearance design, some experts believe that this is a huge communication facility, and it is estimated that it may be a radio antenna device for monitoring the remote communications and intelligence agencies of the former Soviet Union. The interior of the big black bag is round and barrel-shaped like its appearance. It is divided into three floors, with rooms on each floor evenly distributed. When the Japanese troops withdrew, local residents pulled out a lot of food and daily necessities from big black bags. Soon, a hemp knife processing factory was built here, a wall was built, and the "big black bag" was protected virtually. But its function and its secrets have always been unknown. In the middle of the bottom floor of "Big Black Bag" is a well, which looks no different from an ordinary well. The entrance to the tunnel is opened in the middle of the well wall, and extends to both sides after entering. In the early days of liberation, engineers entered the cave and returned after advancing about 800 meters. The lowest part of the tunnel is about 30 meters deep from the ground. One side leads to the Cultural Palace (formerly Zhongling Pagoda); the other side leads to Fularji District in Jiangbei. The ultimate insider - Liu Yiquan Liu Yiquan, 73, was a military representative of Jianhua Machinery Factory in Qiqihar City before his retirement, and he was a guard of Zhou Baozhong, a famous general of the Anti-Japanese War. He is the only person known to have ever entered the tunnel. According to Mr. Liu's recollection, in July 1948, General Zhou Baozhong, who was then the deputy commander of the Northeast Democratic Alliance Army, traveled from Harbin to Qiqihar. Zhou Baozhong, escorted by Huang Kecheng, Hong Xuezhi and others from the Zhongling Pagoda (now the Workers' Cultural Palace), was escorted by a platoon of soldiers. ) underground entrance into the tunnel. At that time, an old man named Man Changsheng served as the guide. Man Changsheng was a laborer who cooked for the Japanese when he was building this underground fortification here. He said that this fortification was built for five years from 1931 to 1936. Man said that half of the people who built the fortification were Korean migrant workers, and the other half were Chinese and Mongolian. He escaped after beating to death a "little Japanese" who was guarding the corpse cremation plant of the Japanese army. Mr. Liu said: "Man Changsheng was talking and crying while walking, introducing the situation along the tunnel, and also told us not to touch the switch in the cave. "When we reached the 17th gate, we were already more than 800 meters away, and General Huang Kecheng was afraid of danger. They were not allowed to move forward, so we retreated along the original route.

" Liu Yiquan said: "At that time, I clearly remember that there was a drainage ditch more than a foot wide in the tunnel, the water flowed gurglingly, and there were cables on the wall. " Mr. Liu drew a schematic diagram based on Man Changsheng's narrative and his own memory, which marked the five entrances and exits of the underground fortifications. They are: Zhongling Tower, Gendarmerie, Daheibao, Railway Station, and Japanese Cremation Plant. Liu Yiquan It is said that Zhou Baozhong and his party returned to Harbin the same day after coming out of the tunnel and reported to the Northeast Bureau by telegram, requesting the Northeast Bureau to order a clear investigation of the Japanese underground fortifications. However, for unknown reasons, the Northeast Bureau did not reply, saying that the underground fortifications were on the ground at that time. There are only two buildings: one is the Zhongling Pagoda, which was built by the Japanese specifically to store the ashes of the Japanese dead; the other is the Big Black Bag. According to records, more than 2,000 people of the Japanese Second Regiment were killed in the Battle of Nomonhan in 1939. The Japanese army built the Zhongling Pagoda to store the ashes of the war dead. During the Dragon Boat Festival in 1956, Liu Yiquan, who was studying at the Qiqihar Infantry School Training Camp, received an order from his superiors to blow up the Zhongling Pagoda for three days. During that time, more than 2,000 jars of ashes (the ashes of Japanese soldiers were packed in jars with three colors of red, yellow and white silk) were removed and then blown up. In 1958, Soviet experts designed and built the current Workers' Cultural Palace on the original site. The workers' cultural palace still uses the steps at that time. There are two underground entrances on both sides of the steps leading to the underground. The memories of the engineer Liu Yiquan further confirmed the existence of the underground fortifications. According to Liu Yiquan's memories, everyone discovered that from the train station. There is an underground entrance in the triangle area of ??the original platform, which leads directly to the glass factory. After verification with relevant experts, the glass factory was the bottle-making workshop of the 516 poison gas unit of the Japanese invaders. The six-person team reported the situation to the relevant leaders of Qiqihar City. We will organize forces to conduct a comprehensive exploration and cleanup of this underground magic cave, so that this period of history that has been submerged by time can be brought to light. At the same time, we will completely eliminate the hidden dangers of urban construction, ensure that people's lives and health are not threatened, and use this fortification to carry out Patriotism education activities. On July 31, 2002, Qiqihar Mayor Yang Xin presided over the 76th Municipal Government Executive Meeting and heard a briefing on the underground hidden projects in Qiqihar City during the Japanese puppet period. The meeting decided to prepare for the construction of the "Northeast China". Anti-Japanese War Memorial Hall and Exhibition Hall of Evidence of Japanese Invasion of China in Northern Manchuria. On August 2, 2002, after putting on gas masks and anti-gas clothing, reporters and heavily armed engineers entered the tunnel. The steps, walls, and roofs of the tunnel were all maintained It is in good condition, and some humane designs have been added to some curves and gentle platforms. This shows the good intentions of the Japanese invaders. The tunnel is eerie and the upper part of the tunnel becomes colder and colder. The cement shed surface is said to be able to condense water vapor and silence noise. When the reporter and his party reached about 180 meters underground, the water depth reached half a meter. At this time, the engineers discovered an iron fence and a small cement container. House. After testing the air, the engineers found that the air contained mustard gas (poisonous gas), so the survey was interrupted and samples of the oily substance in the water were taken back for testing. On August 5, the Qiqihar Municipal Government issued a notice requiring the entire city. The people took action to collect relevant information, pictures, physical objects and other evidence of the Japanese invaders, and prepare to build the Northeast Anti-Japanese War Memorial Hall and the Evidence Exhibition Hall of the Japanese Invaders.