The video shows a person swimming underwater in the ocean. The person is wearing a wetsuit and flippers. As the person swims, a manta ray swims by. The manta ray is large and has a long tail. The water is clear and blue, and the sunlight is shining through the surface. The person and the manta ray are the only two visible creatures in the video. The person appears to be observing the manta ray as it swims by.