Bottomless urn introduction: Walking 500 meters from the entrance of the corridor, I suddenly heard the sound of water, like a sudden rainstorm, and thunder rolling back to the wall. I took advantage of a ray of light from the top of the cliff, but I saw a hanging The silver waterfall cascades down, throwing beads and mist into a deep green pool at the bottom of the corridor. The deep pool is only about ten feet wide and unfathomable, so it is called the bottomless urn, and the urnge corridor gets its name from this. A stone staircase dug into the mountain protrudes from the dangerous wall on the north side. The stone staircase is more than 120 steps high and is divided into two sections, the upper and lower sections. There is a suspension bridge in the middle. If the suspension bridge is lifted, people will not be able to pass. Cui Zhenfang, a 17-year-old Xiaobalu, relied on natural danger to defeat dozens of attacks by the Japanese aggressors alone, killed more than a hundred enemies, and finally died for his country.