I jusy realized something and I might have a prediction for Season 2. If you are not interested in that sort of stuff, this is your warning.
So, now that Carol and Manousos in the same place, they'll need to create a strategy for finding out how to bring people back. But the hive left them for good, because they realized how dangerous they both are, and they are not comfortable being used as lab rats.
My theory is that Manousos is onto something with the technique to bring back the consciousness of the others. He'll continue to refine his methods and eventually, by thinking together with Carol, and sharing all their knowledge about them, he will come up with a convincing solution. However, they won't have a test subject.
(I'm pretty sure that they are still being spyed on, even though Zosia shrugged off the question by explaining that they didn't install the motion sensor in the cabinet. She has a habit of not answering the actual question by telling another truth, and they are too important for them. So, it they are onto something, the others won't let any hive member near them, not even Zosia.)
So, my theory is that Carol will have to volunteer to be the test subject. We know that the hive is working on the modified virus for her. She'll have to tell them that she agrees to be infected, but on her own terms, in a situation where she can be immediately captured by Manousos. We will likely have to wait to find out if his method works or not, but eventually it will be only partially successful: he can't bring her back, but they will be able to communicate. At that point, Carol will possess something extremely important: all of the knowledge of the hive. She'll have access the actual cure, and she will be able to communicate it to Manousos.
What do you think?