The year was 2145, life on earth had ceased to exist in the surface because of The Great War. The only survivors were seven million people. Living above ground was only a dream to them. A mile down in the earth's crust, the human race desperately tried to adapt to their new surroundings, that is, until the Den. Only two years after the human race finished their first city underneath, a machine invented by a man named Mavious Rryn was brought to the people. A machine capable of simulating what life was like before the war, before they are forced underground. It became an escape from their nightmare, and Mavious was worshiped for it. It is three hundred years after Mavious created the Den. Since its creation there has been over a million games and simulators additions to the machine. Ray was one of the thousands of young adults who used it to play with friends and experience things they could have never done without it. But now, one of his friends has found something new, something big, something they have never seen before. And it will take every ounce of their strength and intelligence to get them through it, alive.