FERN M HARMON asked Andy Weir:

This question contains spoilers… (view spoiler)

Andy Weir For a while I considered having the whole story be just from Mark's point of view. And at the end he would just "show up" at the Ares 4 site, much to the surprise of the Ares 4 astronauts. That would have been cool, but I decided there was just no way for NASA not to work out he was still alive.
Andy Weir

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