Super-tugs are the sole vessels preventing disaster between massive oil tankers and unspoiled Alaskan wilderness, a heavy-lift crane has to build itself before getting to work, and only one shovel is tough enough to dig in a Chilean copper mine.

Avalanches threaten the Winter Olympics but a helicopter provides the power to overcome mother earth, a country builds an amphibious system of flood defences in a fight to survive beneath sea level, and a specialized crane is key to reuniting two countries.

A powerful crane vessel pieces together an oil rig in the world's busiest harbor, digging a tunnel linking two countries requires chewing through rock beneath a peaceful seaside village, and armored heavy haulers remove lethal slag from a smelting plant.

The premier heavy-lift ship transports one of the largest cargoes ever moved in one piece, custom-built transporters fight earth's driest desert to deliver a 100-ton telescope, and an army of walking diggers repairs massive damage before winter's snow.

A world-class dredger has 4-hours to cut through hard volcanic rock to avoid a multi-million dollar traffic jam, a demolition rig wreaks destruction until threatened by a force stronger than itself, and a battle-proven chopper is put to the test.

The world's most powerful backhoe dredger digs up New York Harbor to clear the way for bigger cargo ships, a revolutionary new firetruck protects an international airport, and a mobile factory rushes against the clock to rebuild a railroad.

The world's biggest wheeled loader digs a copper mine out of peril, an assault transport carries troops across any terrain and when it runs out of land it goes straight into the water, and the largest mining machine keeps a country running.

The longest road-going vehicle in the world heads into dangerous territory to bring electricity to an isolated region, a tunnelling behemoth dares to dig a new subway system under a bustling historic city and a sleek new vessel fights the war on narcotics.