Disappointed with time spent to go nowhere really

I was really excited about this one. I mean, the cover, the synopsis, it just all sounded really good. But it took so long for anything really to happen. And then, when it did, it wasn't really anything that exciting. It was about a third of the way through, and I got excited, but then, really nothing happened. We never really find out for sure what caused what they had. Or what the people in the world outside were doing. Had this actually affected the outside world? I'm guessing not. And what kind of experiment were they even doing? There were so many different offshoots of the story, and at the end when we start finding things out, they don't all fit in, and something about climate change was inserted as if they were trying to make the story about that or something, but it all just really didn't add up to anything. The ending was very inconclusive, not sure exactly what happened. It was also kind of hard to feel much for the characters, honestly, they weren't really relatable, and nothing about them made me even that sympathetic to them. I'm sorry to say this one is the first book in a long time I've rated below a 3. As I saw another person say, if I hadn't really kind of had to review this, I probably wouldn't have actually finished it. But I just kept hoping the final answers would make all of the story worth it. Unfortunately they did not.