The video features a group of jellyfish swimming in a blue-colored water tank. The jellyfish have a translucent, bell-shaped body with long, thin tentacles trailing behind them. They move gracefully and slowly through the water, creating a mesmerizing and calming effect. The blue background of the tank contrasts with the jellyfish's light color, making them stand out. The video captures the jellyfish from different angles, highlighting their delicate and intricate movements.