Introduction to the network stone trough: Haitian Range Rover is located in the martial arts hall, the largest hall in Boyue Cave. The 1.5-meter-deep network stone trough hanging upside down from the top is currently the deepest ceiling-suspended geotrough in the world. Under the stone trough, there is a calm clear water. The stone trough reflects the water, and the water and sky are the same color. With the flow of light, the stone trough is like the unpredictable colorful clouds in the sky, with erratic waves and colorful weather.