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.

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.