The video shows a vibrant underwater coral reef with a variety of corals and fish. The corals come in different shapes and sizes, with some resembling brains and others resembling branches. The fish are seen swimming around the corals, with some hiding among the branches and others swimming in the open water. The colors of the fish and corals are predominantly blue and green, with some fish having yellow and black stripes. The water is clear, allowing for a good view of the marine life.