Engineer turned comedian Tom Wigglesworth and rising star of mechanical engineering Rob Bell climb on board Victor X-ray, a 200-ton, £200 million Boeing 747. It will be broken into tens of thousands of parts in the airline's maintenance hangar in Cardiff, before being painstakingly reassembled and certified fit to fly again. This is the first time this complex process has ever been filmed and it provides fascinating insights into just how a 747 works.

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The world's most enormous machines are stripped down and torn apart to discover their hidden secrets and to reveal how each one has changed our world in it's own unique way.

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