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Top Gear Challenges: Amphibious Vehicles. In this special Top Gear Challenges Episode, The Trio of trouble are issued the challenge of building amphibious cars, and using them to travel to and then across a two mile wide reservoir. This special challenges episode appeared in Top Gear Season 8, Episode 3. Submit a Comment Cancel reply.
Episode Guide. Introduction: Clarkson and Hammond introduce the show by arguing about the properties of the Porsche 997 and the Audi R8. Main Review: Clarkson reviews the Audi R8, Audiâs first supercar. Hammond makes an appearance in his own Porsche 997 Carrera S for a half-mile drag race which he wins by a whisker.