Nasa starts year-long isolation to simulate Mars trip
A team of Nasa recruits is living in isolation for a year to simulate what life would be like on Mars.
Under a dome near a barren volcano in Hawaii, the six-person team are to live in close quarters, without fresh air, fresh food or privacy.
A French astrobiologist, a German physicist and four Americans - a pilot, an architect, a journalist and a soil scientist - make up the team.
Laura Bicker reports.