It is a fact that the voracious crown-of-thorns starfish periodically raid the territory of the Great Barrier Reef of Australia and, destroying corals, turn the blooming reefs into lifeless ones. People are fighting crowns of thorns to preserve the ocean ecosystem. Everything else is a fairy tale about the inhabitants of the underwater world. These include sea turtles, sharks, a whole army of large fish with powerful jaws, and the fastest fish: sailfish and swordfish.