Introduction & nbsp; In Longbang Town, a key border defense town in Jingxi, Guangxi's China Vietnam Golden Tourism Belt, there is a unique border exploration tourism scenic area called the "Underground Great Wall" in Pogala. The underground construction of Pogala, founded in 1892, has always been a national defense military base in China. The fortifications in the mountains have been built for many years, combined with the surrounding terrain, centered on Mount Pogala, with a nine layer underground defense system. The underground tunnels are connected to the surrounding mountain ranges. The underground construction, spanning over ten kilometers, twists and turns through dozens of mountain caves along the border, forming a bizarre military maze. This underground construction facility has different functions such as defending against fire and water attacks, infantry tanks, aircraft cannons, cruise missiles, nuclear explosions, etc. It also has an underground control and command center for observation and communication, command and dispatch, and deployment of troops. The design is scientific, the project is grand, and the defense is strong. By guarding with sturdy light and dark bunkers, opening the thick and sturdy gates made of titanium steel, and entering the reinforced concrete cast tunnel, facilities such as sentry posts, command posts, weapon depots, barracks, underground hospitals, and water and food transportation are readily available