The video shows a beautiful underwater coral reef with various types of corals and fish swimming around. The corals are in different shapes and sizes, with some resembling brains and others resembling branches. The fish are swimming in and out of the corals, and some are hiding in the crevices. The water is clear, and the lighting is natural, coming from the sun above the water. The colors of the corals and fish are vibrant, with shades of yellow, blue, and green. The video gives a sense of the biodiversity and beauty of the underwater ecosystem.