In July 1947, some unusual debris was discovered at Roswell Army Air Field in New Mexico. Was this the remains of a crashed military balloon, or something from much, much further away? Has the US government spent the past 75 years hiding proof of alien life from us all? In our series on history’s most well-known conspiracy theories, Dr David Clarke gives Rob Attar the lowdown about the Roswell Incident and considers how it relates to the long history of UFO sightings.

History’s Greatest Conspiracy Theories is produced by the team behind BBC History Magazine. For more fascinating stories from the past, head to HistoryExtra, the home of ‘History’s Greatest’ podcasts. There you can find other feeds including History’s Greatest Cities and HistoryExtra LongReads. Find out more at historyextra.com/podcast.

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This episode was hosted by Rob Attar and produced by Jack Bateman.

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