People want to live. There are situations where all the choices are bad. If these things are news to you, you might find this movie interesting. Otherwise let me save you some time.
Nothing that happens matters, and nothing that is said is interesting. Nearly everybody dies. It doesn't matter what order they die in - because they all end up dead, and all within an hour of each other. And it doesn't matter who gets to live. Nobody deserves it more than anyone else, and whoever it is, there are still 49 people dead. So it's just a completely meaningless tragedy. World is full of those, don't know why we needed another fictional one.
There are some interesting questions raised; like, who is doing this and why? None of those questions are answered.