On June 3, 2010, a team of six volunteers began the Mars500 experiment: they were locked into a cluster of hermetically sealed habitat modules for the duration of a simulated mission to Mars lasting 520 days. "During the ‘flight,' the crew performed more than 100 experiments, all linked to the problems of long-duration missions in deep space. To add to their isolation, communications with mission control were artificially delayed to mimic the natural delays over the great distances on a real Mars flight." The simulated mission has now come to an end
. The crew managed to stay healthy and sane
, and they've emerged from isolation to be reunited with their families. The ESA's Mars500 page
has further details on the experiment, and they've posted a video summarizing the 'trip.'