With the Earth in a state of ruin, mankind has retreated to living underground where a dystopian society has evolved to ensure continued existence. The inhabitants of the underground silo know that their self contained ecosystem is a fragile balance so they must dole out harsh consequences to anyone who disobeys the rules. These people have lived underground for generations and know nothing of how they got there or why the outside world is so inhospitable; however, they do know that crimes are punished by being sent outside through the single airlock at the top of the silo. The world outside is so toxic that even their best protective suits offer only offer a couple of minutes of life, yet everyone sentenced to die this way is asked to perform a vital service for the rest of the silo before they perish - a cleaning of the external sensors. Would you do such a favor for those who sentenced you to die?