

Mike Davidson goes on a cross-country road trip to help the Well Done Foundation; they work to find and cap some of the estimated 2 million leaking, toxic abandoned oil and gas wells scattered throughout the U.S.

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.

In Philadelphia, Mike is on streets, in tunnels, on tracks and in trolley restoration garages; he is working shoulder-to-shoulder with the team that keeps one of America's largest and oldest mass transit systems running smoothly and on time.

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.

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.

A pilot's decision to let his 15-year-old son fly has disastrous consequences on a commercial flight.

JFK Jr. disappears on the way to Martha's Vineyard; a captain loses his bearings and crashes over the Red Sea; pilots crash a plane over Indonesia.

A complex recovery operation is launched to find out if a 747 which disappeared into the Indian Ocean was carrying illegal weapons.