Get on a speedboat and go all the way along the Saigon River. You can get to the wharf that visits Guzhi Tunnel. You can also get there by car. When Vietnam resisted French rule, soldiers dug underground battleways for more than 20 years with their bare hands. In the lush green jungle, it was not easy for Vietnam to quickly retreat into the narrow tunnel entrance, which was concealed perfectly. Not to mention those well-designed traps, in order to avoid the enemy's more than 200 kilometers of underground anti-Japanese war and life system, kitchens, hospitals, combat rooms, grain depots and so on. The explanation was fascinated by the perseverance and wisdom of the Vietnamese people. I remember the cat's waist went into the tunnel once, which was not in vain.