I hope they tested the food extensively beforehand- could get a bit ugly if there was a bad case of wind

. Oh, they forgot that it was 500 days one way, another 500 days return trip, time on Mars....
I wonder what are the criteria for an early release of one of the inmates. In space it would be a "burial" in space. Maybe a new twist to walking the plank if one of them became too feral.
I would love to put on a bet that they will not make it the full time without intervention or fights. Maybe bets should be taken which of the crewmen will be the most disliked.Mind you, the "real thing" would bring out the best in them.