The video shows several jellyfish swimming in a blue-lit aquarium. The jellyfish have long, thin tentacles that trail behind them as they move. The aquarium appears to be well-lit, highlighting the jellyfish's movements and the blue color of the water. The jellyfish vary in size and are seen at different depths in the water. The video captures the serene and mesmerizing nature of the jellyfish as they float and drift through the water.