The video shows a person swimming underwater in a pool. The person is wearing a mermaid tail and is swimming gracefully. The water is clear and the sunlight is shining through it, creating a beautiful effect. The person's movements are smooth and effortless, and they seem to be enjoying the experience. The mermaid tail is blue and has a shiny, scale-like texture. The person swims towards the camera and then away from it, showcasing their swimming skills.