The Creep

Just before the tube terminal in Camden Town, England, closes, you rush to catch the last train.
The station is eerily quiet, no passengers...just the cold hum of flickering lights. A few minutes after you arrive, you realize you're stuck there. There's no one to answer your calls.
And then you hear it.
A crawl...deep, slow...coming from the tunnels. A step and a breath that don't resemble a human.
As you desperately search for a way out, you discover doors that shouldn't exist, rooms buried beneath the station, rusty tools, and medical records that tell of experiments that were "erased" years ago. The marks on the walls — claw marks, screams, warnings — only indicate one thing:
Something lives in the tunnels...and it's coming