The video features a large sea slug with a vibrant red and white coloration, moving slowly through the water. The creature's body is elongated and appears to be covered in small, white spots. Its tentacles are extended outwards, and it moves in a fluid, undulating motion. The background is a deep blue, indicating that the video was taken in the ocean. There are no other creatures or objects visible in the video, and the focus remains solely on the sea slug.