The video shows a blue plastic dolphin toy swimming in a tank. The dolphin is gliding through the water, and the tank is filled with black gravel. There are also some rocks and plants in the tank, creating a natural environment for the dolphin toy. The dolphin is the only object in the tank, and it moves smoothly through the water. The lighting in the tank is dim, and the water is clear, allowing for a good view of the dolphin and its surroundings.