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A worker stands under the Airlander 10 hybrid airship during its unveiling in Cardington, Britain March 21, 2016. The world's largest aircraft has been unveiled for the first time since being fully assembled in the UK. The 302ft (92m) long Airlander 10 – part plane, part airship – was floated in a First World War hangar in Bedfordshire. The ship was first developed for the US government as a long-endurance surveillance aircraft but it fell foul of defence cutbacks. British firm Hybrid Air Vehicles (HAV) launched a campaign to return the Airlander 10 to the skies in May 2015 and it will now carry out ground testing before 200 hours of test flights begin later this year. The vessel was filled with 1.3 million cubic feet of helium – enough to fill 15 Olympic-sized swimming pools – in a test run last October. The date of the test flight has not been announced but the craft will be restricted to a 70-mile (112km) radius. If successful, an aircraft based on this prototype will go into production. (Photo by Darren Staples/Reuters)
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