Life on Mars: Six people begin year-long isolation experiment in Hawaii to replicate mission to Red Planet

Six people shut themselves inside a dome for a year in Hawaii on Friday, in the longest US isolation experiment aimed at helping Nasa prepare for a pioneering journey to Mars.
The crew includes a French astrobiologist, a German physicist and four Americans – a pilot, an architect, a doctor/journalist and a soil scientist.
They are based on a barren, northern slope of Mauna Loa, living inside a dome that is 11 metres in diameter and 6 metres tall.
In a place with no animals and little vegetation around, they closed themselves in at 3.00 pm, marking the official start to the 12-month mission.
The men and women have their own small rooms, with space for a sleeping cot and desk, and will spend their days eating food like powdered cheese and canned tuna, only going outside if dressed in a spacesuit, and having limited access to the internet.
So what kind of person wants to spend a year this way?