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The finalists head to the Shuttle Landing Facility on Florida's Space Coast as Chris Hadfield probes whether they have considered the risks of the job. They experience weightlessness for the first time as their motor skills are tested at 30,000 feet. In the Florida Keys, they dive down to the Aquarius underwater facility, used by Nasa for training astronauts. They return to London's Science Museum for the grand finale as Chris and the panel reveal who has what it takes to be an astronaut.