Six people shut themselves inside a dome for a year in Hawaii, 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 36 feet (11 meters) in diameter and 20 feet tall.