The video shows a large manta ray swimming in the ocean. The ray is dark in color and has a long tail. A scuba diver is seen swimming next to the ray, holding onto a rope attached to the ray's tail. The water is clear and blue, and the sun is shining through the surface. The ray is moving slowly and gracefully, with its wings undulating in the water. The scuba diver is wearing a wetsuit and a diving mask, and is holding onto the rope with both hands. The ray appears to be calm and unaffected by the presence of the diver.