Just imagine that you're a group of people stuck on a ice planet for centuries.  I think many might start thinking all sorts of strange shit having to live in a box so long.  Not to mention being aware at all times that the only thing keeping you from death being the modules and hydroponics that give you air and food.  

I suppose at least you get to have lots of seafood due to the colonization of the subglacial seas with aquatic animals From earth.  Or I might instead have native life there that shares a common origin with us genetically (might want to avoid higher order organisms in that case, Don't want intelligent life beyond people in this RP).  Would that make it alien life if they share some genetics with us...?