By the time the alarm starts ringing in the bunker, you still haven't found out what happened. You can only guess. One thing is certain - the world will never be the same again. There is a whole new reality waiting for you, where the struggle for resources with other survivors will become the main problem. Get to the truth. Find out what happened to the people on the surface.
Take control over the bunker and expand it. Manage power, production, and even sleep schedule. Rebuild your bunkers and expand them. Send expeditions to the surface to rescue any survivors or the other way around for looting and pillaging. Capture outlying bunkers until your network covers the entire country. Your mission is to repopulate the human race - and only you know how to do it. An unpredictable campaign is waiting for you, in which you will have to get to the truth and find out what happened on the surface.