The video shows a large manta ray swimming in the ocean. The manta ray has a long tail and a wide body with a white underbelly and darker top. It moves gracefully through the water, occasionally flapping its pectoral fins. The ocean floor is visible in the background, covered in rocks and coral. Small fish can be seen swimming around the manta ray. The water is a deep blue color, and the lighting is dim, suggesting that the video was taken in a deep part of the ocean.