In California, brave technicians work at extreme heights to keep a tramway safe for tourists. Crews race against the clock to replace a corroded rail at the Montreal Metro.

In the Netherlands, engineers battle encroaching seawater on storm surge barriers that protect the country from deadly floods. Divers risk their lives to save a flood-ravaged community near Montreal.

Crews wage a battle against moisture at the world's only rotating boat-lift, the Falkirk Wheel. In Blackpool, UK, technicians must fix a roller coaster's broken track before opening.

At a hydro station in Niagara Falls, engineers struggle to solve an issue with a faulty power-generator. Lighting techs attempt a risky fix 45 stories above the Las Vegas strip.

In Oregon, specialised divers remove contaminates from a massive drinking water system. Crews upgrade a communications tower to keep Atlantic Canada connected.

In Canada, technicians battle the elements to keep the country's longest bridge open. Specialists in Alberta work in claustrophobic conditions to keep massive wind turbines rotating.