The video shows a scuba diver swimming underwater with a large jellyfish. The jellyfish has a long, thin, and translucent body that appears to be glowing in the water. The diver is wearing a black wetsuit and has a yellow oxygen tank on their back. The water is a deep blue color, and the ocean floor is visible in the background. The jellyfish moves slowly and gracefully through the water, and the diver follows closely behind, observing its movements.