Doubtful but okay

Rating: 5/10 (14 March 2019)

At first the movie went like whats gonna happen and then like what happened outside the bunker, till is revealed.
My doubts unanswered
How the former girl (who wrote HELP on the glassway near so called air purifying chamber which can be reached through gas tunnel that fits only the slim) got killed/escaped from Howard?
Is he planned Michelle to be his partner?