In the video, a man is seen swimming underwater in a tank. He is wearing a black wetsuit and is accompanied by a large fish. The man is holding a camera and appears to be filming the fish. The fish is swimming around the man, and they seem to be interacting with each other. The water is clear, and the lighting is bright, allowing for a good view of the man and the fish. The man appears to be calm and relaxed as he swims with the fish. The fish is also calm and seems to be comfortable with the man's presence. The video captures a peaceful interaction between the man and the fish in a controlled environment.