In the video, there are several jellyfish swimming in the water. The jellyfish are of different sizes and colors, with some being white and others being yellow. They are all floating around in the water, and some of them are moving their tentacles. The water is clear, and the background is dark, which makes the jellyfish stand out. The jellyfish are the main focus of the video, and there is no other visible action or object in the frame.