— And If The ISS Crew Had To Come Home Early

NASA International Space Station De-crewing and Re-crewing Plan SSP 50715

“De-crewing of the International Space Station (ISS) could occur as a result of several scenarios including; major system failure (unrecoverable or resulting in emergency condition), medical emergency or related problem, or insufficient consumables. Each of these scenarios initiates a decision making process where the de-crewing event will be classified as “planned” or “unplanned” for discussion purposes in this document. The approach to de-crewing is directly related to the scenario classification and additional definitions provided herein.”