There is a "lock dragon well" near the Beixin Bridge in Beijing, according to legend, there was a dragon in the world at the beginning of the Ming Dynasty, and was eventually locked in the well by the great strategist Yao Guangxiao, and as long as the iron chain in the well is pulled, it will anger the dragon, although this is only a legend, but later generations in the widening of the road, found that there are indeed several large iron chains under the manhole cover, and also heard the "dragon roar" in the well, which made people shudder, but after further research, it was found that this is actually the wisdom of the ancients.
According to the "Pear Video" report, Beixin Bridge is located at the intersection of Dongzhimennei Street, there is a "Lock Dragon Well" nearby, legend has it that Beijing City was the hometown of Shuize at that time, floods often occurred, all of which were ghosts of a dragon, Zhu Di's great strategist Yao Guangxiao eliminated harm for the people, after successfully subduing the dragon, locked it into the well, tied several iron chains, and told the evil dragon that "as long as the bridge is old, it can come out", and then named the bridge "Beixin Bridge", indicating that the bridge is always new, and the dragon is forever locked at the bottom of the well.
It is said that as long as the chain is pulled, it will anger the dragon, and it will flood the water and flood the entire city of Beijing, but this is only a myth, there is no historical basis, and there is no dragon. However, during the War of Resistance Against Japan, there was a group of Japanese soldiers who came to Beixinqiao, heard the legend of the lock dragon well and thought that it was a figment, so they pulled the iron chain in the well, and there was a huge noise under the well, and the sound of the sea breeze could be faintly heard, as if the dragon was roaring, the smell was still accompanied by a fishy smell, and then there was yellow sewage gushing upwards, and everyone was frightened to quickly return to its original state.
This matter also aroused the curiosity of experts, after investigation, it was found that there is actually a dark river under the lock dragon well, the water flow is quite turbulent, the water pressure is also larger, when the water pressure reaches a certain level, it will erupt from the wellhead, and may also cause flooding, if it is filled with iron chains, it can effectively control the water pressure problem, so when the chain is pulled up, it will make the water pressure change, causing the water of the dark river to gush upwards, and the well is accompanied by a fishy smell, which may be caused by the color change of the well water, or the decay and deterioration of the object.