
Truckers with nerves of steel take their lives in their hands driving heavily loaded vehicles across frozen lakes to deliver supplies to remote locations in Canada and Alaska. Whether they're bringing supplies to Canadian diamond mines, supplying offshore oil rigs in Alaska or even charting new territory driving over frozen swamps and rivers to bring much-needed supplies to small towns, these extreme truckers face troubles from their machines and from Mother Nature.

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Alex receives a grim diagnosis that might mean it's the end of the road for him; Rick threatens to quit if his boss won't let him take time off to see a doctor; the veterans haul the final loads of the rig move.
Scientists are on the verge of a breakthrough, but the truckers must race against time to dismantle the Mallik Research site before the ice road melts; Hugh trains new driver Isaac; a truck in Rick's convoy experiences mechanical trouble.
Everyone mobilizes to haul away drilling sites before the ice road melts and they are swallowed up by the Arctic waters; Kurt encounters a convoy of "highway maggots"; a trucker volunteers for a dangerous mission.
The crew breaking down the Langley site races to the finish line as rising temperatures melt the ice road; Hugh's back-heavy load makes it difficult to get traction on the slippery surface; rookie Devon Neff makes his debut run.