Horror Movie Idea

After a long day at work, Sarah Cornstone finally made her way to the tube station for the last tube home. When arriving at the station she finds it completely deserted. Re-checking the time she confirms that she's on time and sits down to wait. As expected a train appears from down the tunnel and pulls to a halt. The doors open and she steps onto the empty carriage and takes a seat, relieving herself from her heavy bag and folders. The tube soon pulls away from the platform and takes Sarah down through the dark tunnels. Suddenly, the tube brakes hard and the lights go out, and Sarah is in pitch black, unable to see a thing. Reaching into her pocket she retrieves her phone and makes her way around the carriage, trying to find her way to the front of the tube to the driver. When she reaches the box however, there is no one there. Lights flash through the window from outside so she makes her way to the nearest exit to see if there’s anyone out there. She hears a male cry out and follows the sound of his screams down the tunnel. Wet drips from the ceilings and she hears gurgles and shrieks from something that can only be inhuman. She feels her foot catch on something soft, thinking it’s a rat she shrieks and shines her phone light to the floor. There she see’s a male body, drained of his blood. There are huge tears in his clothes and a large open cut in his neck. Something appears behind her. A wet, slimy hand is placed on her shoulder. Too stunned to make a noise she freezes; hoping whatever it was would just disappear. Leave her alone. The hand began to run up her neck, pushing her hair aside from her shoulder. Now she knew she had to run, but as soon as she made it a little way up the tunnel she ran into something that looked vaguely like a human but with just 2 slits for a nose, squinty eyes and a pale, slimy skin. From here on Sarah’s journey through the tunnels becomes a fight for her life as she defends herself from the creatures that have evolved down below in the darkness to become vicious, human eating animals.