The video shows a man in a black wetsuit and snorkeling mask swimming underwater with a manatee. The manatee is swimming next to the man, and they are both moving slowly through the water. The manatee has a grayish-brown color and a flat, rounded body. The man is wearing a black wetsuit and has a snorkeling mask on his face. The water is clear, and the light from above is shining through, creating a serene and peaceful atmosphere.