In the video, a person is seen swimming underwater with a sea lion. The sea lion is swimming around the person, and at one point, it even swims over the person's head. The water is clear, and the sea bed is visible. The person is wearing a black wetsuit and a snorkel mask. The sea lion is brown and appears to be quite playful. The video captures the interaction between the person and the sea lion, showcasing the beauty of the underwater world.