Ok, I confess that the background story and the movie cover attracted my attention. And when I saw Christopher Smith name here I expected something (Severance, Triangle, I thought I had something good to expect) I will be brief and make a full spoiler here: the premise is good, the execution not so much. It is very inconsistent, like a person will be "forgotten" in a subway station? People don't clean the trains into the night hours? A psycho child from the anti-Blitz tunnels of WWII? No one misses the presence of people (especially workers) in the subway? Come on, that's too much. ...