The city that never dies

The Third World War decimated most of the world's wildlife, only half of the world's population survived. They were sent to one of the 2 safe havens: Alpha and Omega, situated in the North and South Poles. They are pure manmade bunkers going to the deepest parts of the sea.
It was at first heaven, for they were self-sustaining facilities. Full of farms and many rooms for families.
But as time passed, crime was rampant: murders, robberies, rapes,... It was unstoppable. The government finally decided to put a stop and started a crackdown. Putting at least five thousand people in prison each day. Soon prisons were at their max capacity and overflowing. There was only one choice left: Send them back to the main Landmasses. Following the Third World War, many biological and radioactive weapons were used, which, when mixed, created something that all had feared: the living dead.
In an atempt to keep the population docile to the government's wishes, they created a sadistic game for those who were sent to the Landmasses: "You have a week to find the escape pod, situated near your surroundings, only five can escape. When the week is up, the empty escape pods will leave..."
This is the story of some of the prisoners who were sent to the Landmasses...