Don't be like 90% of the people here who watched it brains switched off and gave it one star. Ask questions all the way through, let yr jaw sag at shortcomings in the systems, at the failure - actually half-expected - of technologies, at the uncertainties among the various staff, question their competence - although there is not much lacking - ask where would loyalties lie? How would you cope doing their jobs? Could you take the biggest decision? Say out loud to the person you're watching it with 'would you have done this or that?' Be jointly amazed. At the end there are many questions unanswered...and they are for you to answer. The ending is very much interactive and the answers are very difficult and frightening in this day and age. Do watch it. But switch your fears on properly before you do.