I very thinkful film, although in retrospect, astonishingly thin story. I thought they missed a few marks when exploring the concept of moral imperative. Spoiler: Caleb came to care for Ava, and decided to break her out, making a decision to do the Right and Moral Thing, given the circumstances he was presented with. But there was no down side to his decision. He was not faced with a Choice (protect myself and walk away, versus make a sacrifice for someone in need). He made no sacrifice. Thus, the viewer is not placed in a position of having to ask themselves "what would I risk - how much would I sacrifice - to help a suffering person - even a veritable stranger - I care about?"