Fade to black: Is this the end of oil?

Aberdeen heliport is heaving. Dozens of rig men are waiting to board helicopters and begin a two-week stint in the middle of the North Sea. It appears that business out on the rigs, known simply as "the job" in these parts, is booming. Eventually, it's our turn to board a cramped chopper, shoulder to shoulder with the solidly built workers who sit silently, psyching themselves up for a fortnight surrounded by cold, crashing waves.

Two hours later, we land at a rusting rig named Alwyn, 440 kilometres off the coast of Aberdeen. Ollie Bradshaw, the rig's burly production supervisor, meets the new arrivals.

"What's life like offshore? Busy. Very busy," he says. He's not joking. As we traipse around the rig's two platforms, perched 200 feet above the (thankfully) calm waters of the North Sea, we navigate between the numerous piles of scaffolding, timber and new equipment that take up almost every last square inch of space. The on-board population has swollen to 250 people lately. In some cases, three men are having to share a room, while new digs are built next to the rig's busy helipad, where several flights land and take off each day, delivering a conveyer belt of fresh workers – from painters and decorators to extra scaffolders and, of course, the men whose expertise lies in harvesting fossil fuels from beneath the sea bed.