Will Mellor and Kirsten O'Brien learn to drive a Romanian Army combat tank. They have only a week's training in sub-zero conditions to master the skills needed to race each other. Show more

Rival petrolheads Will Mellor and Kirsten O'Brien compete at an opencast mine in one of the world's biggest vehicles, the Terex TR100, a dumper truck the size of a house. Show more

Will Mellor and Kirsten O'Brien learn to drive and race the world's most sophisticated amphibious vehicle, the 47-tonne, two-million-pound go-anywhere Arktos. Show more

In the French Alps, Will Mellor and Kirsten O'Brien learn to drive and race the gravity-defying and mountain-climbing Snow Groomer, a machine packed with over 400 horse power. Show more

Will Mellor and Kirsten O'Brien take their final and deciding driving test in the tree harvester, a six-wheeled monster truck with teeth, deep in the Uruguayan forest. Show more

Will Mellor and Kirsten O'Brien learn to drive and race the mother of all vehicles, standing 15m high and the powerhouse of the docking industry, the straddle carrier. Show more