Good acting & interesting idea but too many unexplained issues

Rating: 6/10 (28 December 2018)

It is basically a survival story with a nontypical threat to human survival which is never exactly explained what it is. I did not read original novel but I found too many unexplained issues or unbelievable events: why some are not affected and do not kill themselves? (Because they are 'mad'? That's all?) How come Douglas manages to do what he could not do before and exit the garage, harm Gary? (Why didn't he do it before?) Rick says that somebody has to open their eyes because rapids are too dangerous, then Malorie decides that nobody needs to open the eyes, and miraculously they all survive? (How did the small children, not attached by a rope with their mother, know how to swim?) She runs blindfolded holding two children in the forest arriving at the house in no time...in the end there are still a lot of unanswered questions on how humanity can survive - I mean the resources of this 'sanctuary' are not eternal and the 'enemy' outside is still there...