Sanjayan goes in search of a very different future. He travels to one of the remotest reefs on earth. The sheer number of sharks in this place doesn’t make any sense – the mass of predators is greater than prey. It seems like a paradox. But when you understand it, you see how our oceans can be more productive than we could ever imagine. And it’s predators that may hold the secret to bringing back productivity to all our oceans.