Documentary telling the story of one satellite's journey into space and how global agencies and individuals are using satellites in all kinds of ways - farming their land from space, locating ancient water supplies hidden deep beneath the most arid desert regions and tracking ocean currents and the global mechanisms of climate change. As every conceivable aspect of our world is being 'sensed' and recorded, from the skies above our heads to the rocks beneath our feet, here is an in-depth look at the biggest technological revolution since the invention of the steam engine.