World's Toughest Fixes

Sean Riley helps out on a radioactive fix at a nuclear power plant. He's keeping one eye on the Geiger counter as the team installs a new hi-tech turbine.

Riley joins Aircraft on the Ground team at Charles de Gaulle Airport in Paris to fix a Boeing 767 that has damage to its pressure dome.

Riley learns an important lesson by joining the people who work on power lines while the electricity is still on.

Riley joins a commercial dive team in a midocean engine swap out on a huge deep-water construction vessel.

Riley joins engineers at the Paranal Observatory in Chile to move a 23-ton, $15 million mirror. If it's damaged, it will take six years to replace. No pressure then.

Riley joins a travelling daredevil act to fix a 2,000-foot-high TV tower with a faulty antenna.