Are you sure it's a matte painting on the far end? I would have thought it would have been easier and cheaper to simply put a mirror at the far end of the corridor, extending the set by 2X. They wouldn't have to worry about the reflections, since the curve of the hall would hide it.
Number Two: Conform, Number Six! Conform!
Number Six: I will not be stamped, filed, indexed, briefed, debriefed, or numbered! I am a person.