Dolphins and sharks are natural enemies. Although sharks are the overlord in the ocean, they usually act alone, while dolphins are in groups. In this way, sharks are naturally driven away.
Dolphins also have superb swimming and unusual diving skills. Dolphins can dive to a depth of 300 meters, while people can only dive to 20 meters without diving suits.
In addition to the special streamlined shape, dolphins also have special skin structure, which can reduce the water resistance. Eliminate the vortex generated during high-speed swimming, so that the water resistance is greatly reduced.