Anyone who has spent time sailing i

Anyone who has spent time sailing in the open ocean – or been unlucky enough to have found themselves left at the mercy of wind and currents following a shipwreck – knows that most of this habitat is a vast blue desert. You can sail through hundreds of miles of open ocean and barely see a living thing. Life depends on nutrients, and the availability of these is largely determined by the flow of currents. Put simply, where you have currents you have life.