The video shows a large sea snake swimming in the ocean. The snake is seen moving around the ocean floor, surrounded by rocks and coral. The snake's body is long and slender, with a smooth, shiny texture. Its color is a mix of dark and light shades, with some spots and stripes visible on its body. The snake's movements are slow and graceful, as it navigates through the water. The ocean floor is covered in various types of rocks and coral, providing a natural habitat for the snake. The water is clear, allowing for a good view of the snake and its surroundings.