The video shows a large group of crabs moving around in the ocean. The crabs are of different sizes and colors, with some being brown and others being white. They are all crawling over each other and the ocean floor, which is covered in rocks and coral. The water is clear, and the sunlight is shining through, creating a beautiful underwater scene. The crabs are constantly moving, and their movements are quick and agile. The video captures the natural behavior of these creatures in their habitat.