A movie that takes place underground in which a man tries to find his way out

It’s a movie, probably post 2000+ and it starts off with the viewer not knowing any more than the character. A man wakes up underground and wanders around trying to find (presumably) clues as to what this place is.  This is a truly terrible recollection but I remember him reviewing a tape of a guard of some sort? At the end, you find out he was actually in some sort of biome, as the camera zooms out and you see trees and buildings which look abandoned.

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