This video shows a pool cleaning machine in action. The machine is submerged in the water and is moving around the pool, cleaning the bottom. The water is a clear blue color, and the pool floor is visible through the water. The machine appears to be a robotic cleaner, with multiple arms and a long hose attached to it. The machine is moving slowly and methodically, ensuring that every part of the pool floor is cleaned. There are no people visible in the video, and the only sound that can be heard is the sound of the machine's movement through the water.