

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 machines that keep one of the United States' biggest ports moving; he assists a team in moving a 3-million pound crane.

At the Panama Canal, crews repair dam and lock gates, dredge the Culebra Cut, maintain electric mules and restore the watershed while battling drought, erosion and rising salinity.

Host Mike Davidson helps make high-stakes repairs for one of the world's largest open-ocean fish farm operations in Panama.

Coast Guard aviators test themselves in a dangerous exercise to rescue casualties from a mountain; Scientists struggle to land on icy tundra; a bush pilot battles America's tallest peak and cargo crews fight to fit an entire bank on a single plane.

Relying on instinct rather than the rule book, three flights end in tragedy when crews improvise on their final approach.

A passenger ferry sinks after crashing into rocks off the coast of a Greek island, killing 82; it leads to a shocking investigation.

When Air Transat Flight 236 runs out of fuel over the Atlantic, its pilots desperately try to keep their Airbus A330 in the air until they reach land.