The video shows a large group of fish swimming in the ocean. The fish are moving in a circular pattern, creating a mesmerizing effect. The water is clear and blue, and the fish are silver in color. The video also shows a scuba diver swimming nearby, observing the fish. The diver is wearing a black wetsuit and carrying a tank of air. The fish continue to swim in a circular pattern, and the diver follows them, watching their movements. The video captures the beauty and grace of the fish in their natural habitat.