[[http://tvtropes.org/pmwiki/discussion.php?id=b0spoum7&trope=EnclosedSpace From YKTTW]]

ShireNomad: Would LockedInARoom count?

Danel: This sounds like one of the recognised subgenres of Doctor Who stories: "The Base Under Siege". I believe that one series from the Sixties consisted almost entirely of such tales, but more commonly there's one or two a series.

Doug S. Machina: Does ''{{Portal}}'s'' Aperture Science Enrichment Centre count?

OffSide7: What exactly is the difference between this and Closed Circle? They feel similar enough to at least be sub-types of the same trope.