Completely shot on the Canon 5D DSLR digital camera.
Shot in just 10 days.
Only five actors appear in the film.
Just prior to filming, the funding for the film collapsed as well as the chief location. A new one had to be found at the eleventh hour.
Released at the same time as another British film with a similar horrific premise, Danh Sách Tử Thần (2011).