Sean Riley puts on his radiation suit and heads into the radiation zone for his next tough fix, replacing a steam turbine in a nuclear power plant to boost its energy-producing capacity.

Sean Riley joins an elite corps of engineers who dangle from a helicopter and work with live power lines carrying a shocking 500,000 volts of electricity.

Sean Riley helps swap out a 38-ton engine on one of the largest ships in the Gulf of Mexico. The fix must be done in the middle of the gulf—and with swells, wind and rain, things can get complicated.

For this tough job, Sean Riley joins a team of engineers to move and clean a 27-foot, 23-ton, $15 million telescope mirror. Here, three telescopes are used together to form the largest combined telescope in the world.

Sean Riley works to fix a faulty TV antenna nearly half a mile in the air. This extreme fix takes strength, teamwork and guts.

Go on a cruise. They said: In the Bahamas. It'll be a lot of fun, they promised. Mid ocean in the Caribbean, its a race against time. This may be Paradise, but Riley's not on vacation. He's on his way to a titanic fix. An enormous 90,000 ton cruise ship is steaming towards one of the worlds largest dry docks. They need to install a new power plant an enormous diesel generator, but first they have to land this ship. That's when the fun starts Then things get a whole lot tougher Its all hands on deck as a huge crew opens the hull pulls out the piping, makes room for a two story addition and struggles to cram a massive new 320 ton generator inside the ship then puts it all back together And in record time! In just twenty days this liner is taking on its next bunch of customers and if the ship is not ship shape there's likely to be a lot of harsh words spoken on board.

Riley joins a team of industrial divers on the Caribbean island of Curacao to salvage and repair the 50-ton rudder of a ship carrying $3 million worth of iron ore.