

A ride through Eastern Europe aboard heavy-hauling trains shows the logistical and mechanical challenges of making a multimillion-dollar cargo delivery.

Mike Davidson goes to the biggest automated package sorting facility in the world, UPS Worldport in Louisville, Kentucky; two million packages go through here every day.

Mike helps fix the vessels that the U.S. Coast Guard use to keep the oceans safe; he replaces key parts of ship engines, removes a large crane from a buoy tender, and fixes a helicopter for a critical exercise.

Mike Davidson heads to Brazil, where an offshore crew is racing the clock to set up giant power ships to deliver electricity to a country in desperate need.

In Grindavik, Iceland, crews repair earthquake fissures, build lava barriers and track magma, gases and ground movement while divers inspect a damaged harbor pier in a town shaped by ongoing eruptions.

At Cirque du Soleil in Las Vegas, Mike embeds with the talented teams that maintain the amazing machines behind Cirque du Soleil's stage shows.

Pilots fly over the dangerous Brooks Mountains, so engineers can fix a remote weather station; a veteran pilot tests a rookie on their bush plane landings; crews fight ice and wind to save a winter festival; engineers race to repair a 737.

A Swissair passenger jet catches fire midflight and crashes into the Atlantic, leading to one of the largest investigations in aviation history.