

Host Mike Davidson assists on a multi-million-dollar tunnel-boring project underground in Toronto.

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.

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.

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

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.

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 look at the fate of United Airlines Flight 232 which crashed into Sioux City's runway in 1989; it caused a subsequent explosion that left 111 people dead.

Three planes fall prey to deadly winds, and it is up to investigators to find out why.