In the video, a person is seen swimming underwater in a pool. The swimmer is wearing a black and red wetsuit and is using a red and black snorkel to breathe. The water is clear and blue, and the tiles on the pool floor are visible. The swimmer's arms are moving in a freestyle stroke, and bubbles can be seen rising to the surface. The swimmer's legs are also kicking, propelling them forward. The video captures the swimmer's movements from different angles, providing a clear view of the swimmer's technique and the underwater environment.