This is an underwater documentary photography work taken in Antarctic waters. It captures the moment a group of emperor penguins dive collectively from under sea ice to the deep ocean. In clear gradient blue seawater, each penguin drags a milky white bubble trail generated by high-speed swimming, full of dynamic sense. Emperor penguins are unique cold-resistant birds in Antarctica, which can dive for a long time at hundreds of meters depth under ice to forage. This picture perfectly shows their free and vigorous swimming posture, presenting pure and vibrant polar ocean atmosphere.