03:50Witness HistoryMars-500 isolation experimentBBC World Service Duration: 9 minutes Fri 19th Mar 2021, 03:50 on BBC World Service Americas and the CaribbeanAvailable for over a yearListen nowWhy six men were locked inside a spacecraft on earth for 520 days Show more GenresFactualHistoryFormatsDocumentariesBrandWitness History Source: BBC Online