Four engineers emerged from a NASA-funded simulated Mars mission on October 31 after spending more than a year inside a 158-square-metre, 3D-printed habitat at NASA's Johnson Space Center in Houston, Texas.

The crew grew their own crops, conducted science experiments, and performed simulated Marswalks on a model of the planet's surface outside their habitat during the extended confinement.

This exercise was the second in a series of NASA simulations designed to test how long-duration space missions affect astronauts' health and performance.