In the video, a man is seen swimming underwater in a large aquarium filled with various types of fish. The man is wearing a red shirt and is holding a yellow rope. The fish are swimming around him, and some are even swimming near his face. The aquarium is well-lit, and the water is clear, allowing for a good view of the fish and the man. The man appears to be enjoying his time underwater, and the fish seem to be comfortable with his presence.