The year is 1968. Soviet union armies are crossing the borders of Czechoslovakia. You are waking up in your apartment to loud gunshots and roar of airplanes crossing the skies. Full of fear, you ran downstairs to hide in atomic shelter in basement of the building. And thats where our story begans. We have real atomic shelter from 1960s and co-worked with mechanical engineers on some puzzles, so it is authentic and technologicaly advanced :-)