Dead Man's Letters

The plot is set in a town after a nuclear war, which was caused by a computer error and the failure of the operator to prevent the missile launch — he noticed the mistake, but choked on coffee and was not able to shout respective commands in time. The town is destroyed and polluted with radioactive elements. Police curfew is established in the immediate vicinity and only healthy people are selected for admittance to the underground bunkers. The main character, played by Rolan Bykov, is a Nobel Prize in Physics laureate, who tries to survive and helps a small group of children and adults survive by staying with them in the basement of the former museum of history. Read more on Wikipedia.