Jeremy Clarkson tries out the legendary Riva speedboats on the Italian Riviera, Apache helicopter gunships in Georgia, USA, and, 100 miles north of the Arctic Circle, the weird machines used for travelling on snow and ice.
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[Photo caption] Snow laughing matter... Jeremy Clarkson tests the world's first snowmobile in Extreme Machines

Jeremy Clarkson's Extreme Machines 8.30pm BBC2
Skates are fast enough for most people who want to glide over the ice in northern Sweden, but not for Top Gear's boy racer. Give him a powered sledge with an engine loud enough to force him to shout, though, and he's a happy man. On his trip to Kiruna, Jeremy Clarkson samples a variety of snowmobiles, from a Model T-type jalopy to a state-of-the-art dragster that slices across the ice.
Our driver manages to keep his cool when he's transported across an Italian lake in the world's most expensive speedboat, the Riva. He also meets an American who owns a train set with a difference, checks out hovercraft-racing in France and takes a look at the Apache, the US Air Force's $14-million helicopter.