One of the reasons London was chosen for the setting is because the city has such an intriguing history to it, as it's been home to some of history's greatest calamities, such as the Great Fire of London, the plague, and the Blitz. It's also got great architecture, which helps make the buildings in the game look good. But most importantly, there's the Underground, which consists of far more than the world-famous Tube. There are ancient Roman aqueducts, old bomb shelters, and Victorian ballrooms. Most interesting, though, are the disused and abandoned Tube stations. Apparently, to keep people out of them, the British government actually pays people to guard them. The game plays on this real-world anecdote by postulating that those guards may be there to guard against something else. In the game, the demonic gateway originates underground. We got to see some of this subway action during the demonstration, as the game showed us some of the underground levels, all of which are randomly generated.​