Board Thread:General Discussion/@comment-27819070-20170310212639/@comment-27819070-20170311053214

The only thing in space (to my knowledge) that could house any real number of people is the Arks Earth Monitoring Station, and they would need to find some way to fix the Oxygen and life support, since it is still running dangerously low from season 1. Bringing grounders onto the Ark seems like a disaster waiting to happen... if that scenario arises, Clarke may wind up pulling another lever :).

Nightblood still seems like the most feasible solution, especially if they want to save more than a couple hundred people.