Is it a boat? Is it a Jeep? It's the world's fastest amphibious car!

Forget forking out hundreds of thousands of pounds on James Bond's 'submarine' Lotus Esprit at an upcoming auction, there are far cheaper ways of tackling both land and sea.

California-based WaterCar has created the world's fastest amphibious machine that can transform from Jeep-like land vehicle to all-out speedboat in just 15 seconds.