The video shows a scuba diver swimming underwater in a tank. The diver is wearing a black wetsuit and has a scuba tank on his back. There are several fish swimming around him, and the tank is decorated with rocks and coral. The water is clear, and the lighting is bright, making it easy to see the diver and the fish. The diver is moving slowly and gracefully, and the fish are swimming around him in a relaxed manner. The video captures the serene and peaceful atmosphere of the underwater world.