The video shows a large group of fish swimming in a tank. The fish are of different sizes and colors, and they are swimming in different directions. Some of the fish are yellow, while others are silver. The tank is filled with water, and there are bubbles rising to the surface. In the background, there are some people wearing scuba gear and swimming in the water. The people are waving at the camera and seem to be enjoying the experience. The lighting in the tank is bright, and the water is clear, allowing for a good view of the fish and the people.