Metro 2033 was released late in 2010 and was set in a post apocalyptic Soviet Russia where the last survivors of the Russian populace have taken refuge in the extensive underground metro system. The sequel, Metro: Last Light, is set a year after the events of Metro 2033 and, playing as Artyom (the protagonist from the original game), “you hold the key to our survival – the last light in our darkest hour…”. However what was never fully explained was why did everyone take refuge in the metro? Because it was underground or did the metro have some secret dual purpose?
It would seem from the recently released cinematic trailer that the metro was designed to act as a refuge in the event of an atomic attack. It would also seem from this trailer that not everyone could be saved giving rise to the possibility that the mysterious “Dark Ones”, the mutants of Metro 2033, could have actually been humans. What can be said for definite though is that this stunning live action trailer explains beautifully the origins of the Metro series, exploring the desolation of Moscow and equally builds anticipation for what could be the next big survival-horror game.
Source Enter The Metro- Metro Last Light Official Page

