Watched this last night.
https://en.wikipedia.org/wiki/Buried_(film)
Hard to imagine how you could stretch the simple premise of a guy being buried in a coffin over a whole film and still make it engaging, but like Colin Farrell - or rather, to be fair, Kiefer Sutherland - in
Phone Booth, it really works and Ryan Reynolds does a great job. Expected ending, though with a very clever twist or two. Recommended, unless you suffer from claustrophobia!