The video shows a large sea turtle swimming in the ocean. The turtle is seen gliding through the water, with its flippers moving slowly and gracefully. The ocean floor is visible in the background, covered in rocks and coral. The water is clear, and the lighting is dim, creating a serene and peaceful atmosphere. The turtle's shell is a dark color, and it appears to be healthy and well-fed. There are no other sea creatures visible in the video, and the turtle is the main focus.