Aside from that group of Russians doing the "Mars isolation chamber study" (think it's Russians?)... we now have another group that in coming months might be able to tell of us of the extreme difficulties involved in living in cramped quarters with no outlets of any kind for months on end.
Freakin miracle they're all alive, but you have to wonder how all those people will hold out if it takes 3 or 4 months to get to them. I mean with each other. Even if they miraculously stay healthy with the food and hydration gels, there's the psychological aspects.