Space Cadets (2005) TV Series

A group of starry-eyed applicants are auditioned to undergo intensive training in Russia before being flown 100 kilometers up into near space. Here, they will spend up to five days orbiting the Earth. Unbeknown to them, they won't be in space at all... They won't even be in Russia. They'll actually be in a disused military base at a secret location somewhere in the UK, possibly the most audacious, complicated and ambitious practical joke in television history. (imdb)