As Lena lives a life of safety and comfort inside the walls of her city, the 86ers fight a terrible battle against an unstoppable and inhuman enemy.
We can't see them, 
but if we listen carefully,
،لا يمكننا رؤيتهم، لكن إن استمعنا بتمعّن
Selbst wenn ihr sie nicht sehen könnt,
Aunque no los veamos,
Aunque no los veamos,
Nous ne les voyons pas,
Forse non possiamo vederli, 
ma se ascoltassimo attentamente
Não podemos vê-los,
mas, se tentarmos ouvi-los,
Да, мы можем их не видеть…