I remember a few years back i put in a DVD and they playes trailers before the actual movie began. One of those was about a dozen or so young adults who lived in a world that had been ruined. Eventually, they found a safe kind of cave but only ten of them could live there. So they had to choose which ones were “worthy” enough to be safe. It saw this trailer a around 2010 but I can’t remember its name… Would appreciate an answer. Thanks!