In the blue and peaceful sea, there lives a pair of good friends, the great white shark Pig and the little bamboo shark Bubble. They swim back and forth between the coral reefs all day, watching their little friends who are about to come into this world. However, greedy humans dive to the bottom of the ocean and wantonly catch shark eggs just to satisfy their appetite. At the same time, unscrupulous modern factories dump wastewater and waste at will, and the blue sea becomes turbid. Pig and Bubble each have their own troubles. Pig has always eaten tires, but now he hopes to try new food; Bubble sees the shark eggs being captured by his compatriots, and he hopes to go to land with the help of Dr. Octopus to rescue his companions. Humans are destroying the ocean more and more, and the animals in the sea seem to be preparing to unite to save their homes...