Working thousands of feet above the California desert, brave engineers and fearless crews perform perilous high-wire acts to keep the a hi-tech tramway system operating safely for the hundreds of daily tourists it transports.

When sea levels rise, storm surge barriers work overtime to fight off devastating floods; to get this tough job done, a team of experts maintain these engineering marvels to prevent catastrophe and keep millions of people safe.

Maintenance crews at a remote airstrip are exposed to the elements as they keep water-bombing aircraft flying to battle forest fires, and mechanics race against the clock to get transport helicopters to safely shuttle oil rig workers.