From the skies, Steve uncovers the otherwise hidden patterns, rhythms, networks and systems that keep Australia on the move, fed, alive and thriving. This week we look at why we live where we live in the world's largest island continent. Taking a unique aerial view, viewers discover the peril of sprawl and the struggle for survival on the continental fringe. Steve takes to the skies with coastal erosion expert Andrew Short to better understand the consequences of Australia's lifestyle. In places such as Kingscliff and the Gold Coast it means building seawalls to keep the ocean from devouring the coastline and towns. Next, Steve examines what it takes to keep the sprawling suburbs running. Data visualisation shows the GPS traces of hundreds of ships as they bring in the goods we no longer manufacture. At the Port of Melbourne, crane driver Sharon Bowker looks down at the Chinese vessel she unloads. Clothing, food, white goods, furnishings, caravans - and much more - are unloaded at Australia's largest container port. But as our suburbs spread, so does crime. The best way to fight back is from above. On patrol with NSW police helicopter, we are on the heels of outlaw bikies. In a sprawling city of 4.5 million, aerial patrols are now a crucial law enforcement tool.