Environment design - The Haunted Subway

Background story - Damian a common man who moved to a new city and to a new apartment. He recently joined a new job and its been over a week now everything seemed normal. He got a bit late everything seemed usual but it was not. He got ready climbed downstairs and waved for a cab But there was non and out of nowhere a very old odd cab showed up. he rushed in. He didn't see the cab driver and just said "just take me to the closest subway station." He didn't reply anything and started driving. Within 3-4 mins they arrived at a subway from outside everything looked normal but as he started going in every started changing everything got dark and darker and he ended up in the dark haunted subway. He thought will have to reach to the other end of the subway to get out, but how will he or will he? 
Is there any end of this nightmare? Maybe he is dreaming and he needs to wake up help him out or he will be stuck there for ever. I tried to create simple walkthrough of a horror game. All blueprint references were learned from YouTube videos and other tutorials. I am trying to learn as much as possible to meet industry standards.