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World's largest airship is unveiled:
The world's largest airship has been unveiled, as the enormous Pathfinder 1 begins its first round of flight tests.
Measuring 400 ft (121.9 metres) in length, this gargantuan blimp is nearly twice the length of a Boeing 747-8 quadjet, the world's longest aircraft.
The blimp uses approximately one million cubic feet of helium and 12 electric motors to achieve vertical take-off and speeds of up to 75mph (120km/h).
The vast airship has been created by LTA Research, a company backed by Google co-founder Sergey Brin.
Its creators say that craft like this could one day reduce the carbon footprint of air travel and shipping.