The space station.
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World War Z
uring the World War Z, many last-ditch survival radio stations such as "Radio Free Earth" helped save millions of lives, or at least tried to. The efforts of these men and women would not have been possible without The ISS, which helped keep essential and possibly some of the more casual satellites up in orbit for continued human use.
In the beginning of the war, the ISS crew was divided into two groups - those who would go back to Earth and those who would stay. It was a hard decision, but, there simply was not enough time and space to send all the crew back to Earth. The remaining three stayed up there and "listened to the same old records, read books, and repaired satellites." They said they had only a few more years with the supplies they had. Eventually, they were able to come into contact with the Chinese Space Station, which was divided between the Rebels and Loyalists. They arrive to find one of them dead and the escape pod jettisoned. Presuming he was the Rebel, they say their respects, and scavenged needed parts.